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Full text of "Radio Electronics (November 1981)"

HOW TO CONNECT YOUR VCR 
TO MORE THAN ONE TV SET 



S1.25 NOV. 1981 




VIDEOTEX DELWEW 



Next TV revolution 

VIDEOTEX 

Information explosion 
Build this 

J EXPANDED SCALE VOLTMETER 



1 Ihls ear's »p»ctflcot !•■*>■■ 

2 Your Corf a* "port 



For your 



■ EtooOoln ] 

Gov't 

Knj.irf Pork St it luofhtngUn 

Irons It 

Llms 



workbench 
All about 

TEMP MEASUREMENT 

Circuits and systems 



BS's new 

!X NOISE REDUCTION 

or phono records 
iuperscope's 

MANOCORDER 

furn your piano 
nto a player piano 






md-*a*t «. H (tfrlM 

of th» MOT Id ^^^ 

SS\ Br dT *•_ 356-323 BC 

PWpi ■ of the- Greet 

*■ '-philosopher Aristotle., 

ot the age of 26 he sue 

father. Phil 

*• iff II of Hacedon. to Uv 

■*hrone. He united th 

Creek city - states an 



..i India. Alexander rulei 
22T £? .O^eatest eapire of the 1 1 m 



2 World Book 



In one year our K 4 P antenna 

has become the largest selling 

CB antenna in the world! 

3. It's proven best! 



1. It's more 
expensive . . . 

S4*.*° 






2. It's made 
better. . . 



suggested retail 



And when you 

pay more, 

you expect more! 

MORE PERFORMANCE: 

The K40 is guaranteed to 
transmit further or receive 
clearer than any antenna it 
replaces. We know it will. 
We've tested it with 771 
CB'ers just like you for one 
year. 

MORE FLEXIBILITY: 

You can fit your K40 to any 
mounting surface. It will fit 
any vehicle you'll ever own! 
That Includes choppers, dune 
buggies, gutters, mirror 
mounts, luggage racks, trunks, 
hatchbacks, through roofs, 
semis, pick ups and RV's. 

MORE QUALITY: 

It's not imported. It's not 
made in Taiwan, Korea or 
Japan. Its American made in 
an American town. Ifs made 
with better materials that 
cost more and by profession- 
al people we pay more, And 
we designed it right 
here in the U.S.A. 

'Including option- 
al mounts at extra 
cost. 



...This 

Antenna 
is so 
DYNAMITE 
you receive a . . . 

I 




...Here's what the leading CB 
publications said. 

CB TIMES: ", . . it's not often that a product bursts onto the mar- 
ket scene, dominates and improves CB'ing for everyone, American 
Antenna and the K40 are doing it — repeated tests showed the K40 
could out-perform the ma jor competitive brands." 
RADIO-ELECTRONICS: "The results of our tests showed 
that, in three different positions of the monitoring receiver, the 
mode/ K40 equaled or out-performed the competitive antenna! 
Apparently, American Antenna's advertising is not merely Madison 
Avenue showmanship." 

PERSONAL COMMUNICATIONS: an impressive 

95% of the trials, the K40 out-performed the existing mobile anten- 
nas. We had to try one for ourselves. 

". . . in every case, the K40 either equaled or out-performed its 
competitor. 
"Mo ifs. ands, or butst The K4Q Antenna from American Antenna would have to 
be just ab out the best antenna around 

CB MAQAZINE: "Introduced in October, 1977, the K40 quickly became the 
top seller and in mid 1 978, became the number one selling antenna in the nation." 



...Here's what CB'ers all 
across the country said. 

ANTENNA SPECIALISTS: ". . . truck driver and CB'erfor 
1 years . . . 50% further than my M4 1 ' Big Momma'." 

— J.H. Coma. 207 Mcf m, Basfrep. la 
AVANTI: "I'm an electronic technician with a Second Class 
FCC license ... I was able to transmit 70% further and tune 
the SWR 75% lower than my Avanti," 

— H.R. Castro. VRB, MonserranlB D-G7, SaHnes, Puerto Rico 

PAL: ". . . 20% better in transmission and 
reception than my 5/8 wave Pal Firestik." 

—John A. Blum, Box «s, Zeltsnople, PA 

SHAKESPEARE: ". . . I've been a CB'er for 
three years and the K40 is the best I've ever 
had. Better in reception and transmission than 
my Shakespeare." 

— H Bsarlert. Jr.. 1 5 Kino fltf. Par* Ridge. NJ 

HUSTLER: "Compared to my Hustler XBLT- 
4, the K40 can consistently transmit 40% 
further and the reception was better. The K40 is 
the perfect way to complete a CB system.' 

-Jerome R Brown. 7B00 S. Ltnder, Burhenk, 1L 



GOOD 

STUFF 

FOR PROS 

ONLY! 




(SPECIAL NOTE) 

IF YOU'RE A 



Our K40 Dealers will be hap- 
py to sell you any of the older 
style and less expensive an- 
tennas that are great bar- 
gains for any beginning CB'er. 



AME_ 

ELGIN.IL 601 20 



_NNA 



C0PVRI6HT AMERICAN ANTENNA 1 979 



POWER! 

mmmud 
Sold exclusively by ^j^J American K 40 Dealers throughout the U.S. & Canada, 



:le ao on free information care 




















Magnamx model 4012. 

' 9-inch diagonal measurement " 

AC/ DC color portable 

with electronic tuning wheel 

anil dial scale indicator. 






Magaatia model 4265, 

l&inch diagonal measurement 

Star System. All Star System 

sets give you infrared remote 

control. 105 channel capability. 

. a utomatk switch ing between 

two channels, display time 

of day and channel number 

on TV screen. 



- 



Magnavox. A picture you 
can rely on time after time- 

X 




TELEVISIONARY. 

Magnavox sees the next _ 
stage of televiewing with 
you as the participant as 
well as the recipient, 

For that, you will need 
the most reliable color 
television possible. 

And now Magnavox 
Star* System coior 



television sets combine 
advanced design concepts, 
high technology and r.ew 
manufacturing systems 
to deliver the highest level . 
of reliability in Magnavox 
history, 

Magnavox.Television — 
as visionary as tomorrow. 
With a picture as reliable 
as it is bright and clear. 

Time after time. 









lWagnawix model 5260. 

25- inc h diagonal measurement 

— Star System. This set even 

has expanded range 

high-fidelity sound. 



TV dhcIut&s and wood-grain cafrmeis sjrrnjJaTed 

All mode's shown ore Star Syslefra except model 4012 



LYifM 

lir 



*¥ 



k^r*\Yi 




The brightest ideas in the world are here toda y. 



P 



I 



C 1381 N A P CONSUMER ELECTRONICS CORP 



CIRCLE 30 ON FREE INFORMATION CARD 



— 



More ways to Li the value... 
with B&KPRECISION 



No 



(ow you can choose die capacitance 
measurement instrument you need from 
die Industry's most complete line. I r or 

-peed sorting, there's the 835 Digital 
Capacitance Comparitor; and for less 
specialized applications, the 830 
Autoranging C-Meter and the 820 Manual 
Ranging C-Meter. All 3re GSA listed 

The 835 is a rugged production tool 
for isolating out oi tolerance capacitors 
in the shortest possible time. Program-in 
acceptable high and low capacitance limits 
and then start testing. The 835 indicates 
"LO," "GOOD" or "Hi." It also intlical 
capacitance values on an autoranging 
C-nn 

Combining autoranging and portability, 
the li&K- PRECISION 830 C-meter offers 
features that are tough to match at any 
price. Resold i ion tsOJ pF.with readings 



displayed on a large 3-!/2-digit LCD 
display. Basic accuracy is 0.2%, much 
greater titan the tolerance of most 
capacitors. Ease of operation is another 
strength of tiie 830. Even untrained 
workers can quickly learn its operation, 
though its performance also makes it ideal 
for engineering lab use. A selectable 
"range hold" is also featured. 

For field or bench applications suited to 
manual ranging, B&K-PRECISiON offers 
the 820 — the industry's best C-meter value. 
The 820 displays readings to a lull ! Farad 
on a 4-digit LED displav. Accuracy is within 
0.5%. 

All of the B&K PRECISION 
C-measurement products are protected 
against charged capacitors. They all 



also allow you to measure unmarked 
capacitors, verify capacitor tolerance, 
measure cable capacitance, select and 
match capacitors for critical applications, 
perform quality assurance, measure 
complex networks, set trimmer capacitors 
and check capacitance in switches and 
other components. Options include the 
CF-10 test fixture for volume sorting; 
and for the 830 and 820, rechargeable 
batteries, AC charger and carrying case. 

For immediate delivery or more details, 
see your local distributor, and see why 
B&K-PRECKSION continues to be the 
leading supplier of digital capacitance 
measurement Instruments. For the name 
of your nearest distributor call toll-free 

800-621-4627. 



BU^^^fl] 



DYNASCAN 

CORPORATION 



6460 W. Cortland Street • Chicago. IL 60635 ■ 312/669-9087 

International Sales. 6460 W Contend Street. Chicago IL 60635 USA TELEX: 25-3*75 
Canadian Sales. Atlas Eloctfofi.cs. Onlfjno 




Model 820 $185 
Model 830 S229 
Model 835 1675 



CIRCLE 58 ON FREE INFORMATION CARD 




Electronics 

Electronics publishers since 1908 



THE MAGAZINE FOR NEW 
IDEAS IN ELECTRONICS 



NOVEMBER 1981 Vol. 52 No. 11 



SPECIAL FEATURE 



BUILD THIS 



TECHNOLOGY 



43 VIDEOTEX 

How your TV will be able to supply you with all the information 
you need, when you need it. Richard Larratt 

47 LOW FREQUENCY FILTER 

Eliminate the effects of annoying low-frequency record 
"noise" with this simple circuit. Joseph M. Gorin 

52 EXPANDED SCALE VOLTMETER 

Here's a way for you to add super accuracy to your 
analog voltmeter. T.J. Byers 

66 SYNTHESIZED RF GENERATOR 

Part 3. How to complete, calibrate and use the 
Programma-2, Gary McClellan 

4 HOME ELECTRONICS 

Tomorrow's news and products in this quickly 
changing industry David Lachenbruch 

22 SATELLITE/TELETEXT NEWS 

The latest happenings in communications 
technology. Gary Arlen 

57 ELECTRONIC TEMPERATURE MEASUREMENT 

What you need to know to build your own electronic 
thermometers- Joseph J. Can- 

60 SUPERSCOPE'S PIANOCORDER 

The player piano isn't dead — it's now 
electronic! Warren Baker 

78 HOBBY CORNER 

Remote weather-sensing instruments. 
Earl "Doc" Savage, K4SDS 

90 NEW IDEAS 

A battery saver for your car. 



COMPUTERS 



82 COMPUTER CORNER 

Looking for a computer Kathy Tekawa 



VIDEO 72 ONE VCR— MULTIPLE TV SETS 

How to use an MATV system to distribute programs from 
your VCR. James E. Kluge 

92 SERVICE CLINIC 

Mew shutdown circuits. Jack Darr 

93 SERVICE QUESTIONS 

R-E s Service Editor solves technician's problems 

AUDIO 63 CBS' CX NOISE-REDUCTION SYSTEM 

How CBS produces companded records that can be played 
with or without a decoder Len Feldmart 

EQUIPMENT 26 Creative Electronics ESR Meter 

REPORTS 26 Realistic Model TV-20 High-Fidelity TV Tuner 

28 Chromatics Chroma Chime Electronic Door Chime 

36 Ungar Model 4000 Hot Vac Desoldering System 



ON THE COVER 

Television has already revolu- 
tionized the way we live. A second 
TV revolution is now under way 
with the introduction of video- 
tex. Videotex will allow you to 
use your TV set to receive infor- 
mation on almost any subject 
you desire — news of all sorts, 
local special events, and even 
restaurant menus, (n addition, it 
will permit you to transact much 
of your personal business— shop- 
ping, banning, etc.— from home. 
For a look at what's in store, turn 
to page 43. 




VIRTUALLY ALL STEREO records contain very, 
low-frequency signals that can be annoying to 
listen to and. potentially, can damage your 
sound system. A low-frequency filter wilt re- 
move those signals, and plans for such a de- 
vice begin on page 47. 




SOMETIMES ITS DESIRABLE to connect several 
TV sels to the same VCR. If you have a master- 
antenna setup, you can use it for that purpose 
Several methods for taking advantage of your 
MATV facilities are described, starting on 
page 72. 



Radio-Electronics, (ISSN 0033-7B62) Published monthly 
by Gernback Publications. Inc.. 200 Park Avenue South. 
New York, NY 10003. Second-Class Postage Paid at 
Mew York, N.Y. and additional mailing offices. One-year 
subscription rate: U.S.A. and U.S. possessions. Si 3 00 
Canada, $16.00. Other countries, $20.50. (Cash orders 
only, payable in U.S.A currency .| Single copies 
$1.26. 'c; 1&B1 by Gernsback Publications, Inc. All rights 
reserved, printed in U.S.A 



DEPARTMENTS 



16 


Advertising and Sales Offices 


24 


Letters 


136 


Advertising Index 


102 


Market Center 


98 


Books 


96 


New Lit 


104 


Computer Market Center 


84 


New Products 


16 


Editorial 


6 


What's News 


137 


Free Information Card 







Subscription Service; Mail all subscription orders, 
chances, correspondence and Postmaster Noltces o< 
undelivered copies (Form 3579) to Radio-Electronics 
Subscription Service. Box 2520. Boulder, COA0322 

A stamped self-ad dressed envelope must accompany 
all submitted manuscripts and/or artwork or photo- 
graphs if their return is desired should they be rejected 
We disclaim any responsibility tor the loss or damage of 
manuscripts and/or artwork or photographs while in 
our possession or otherwise. 



Z 

Q 
< 

00 



As a service to readers, Radio-Electronics publishes available pltans or information relating to newsworthy products, techniques and scientific and technological developments. 
Because of possible variances in the quality and condition of materials and workmanship used by readers* Bad to- Electronic* disclaims any responsibility lor the safe and proper 
functioning of reader-built projects baaed upon or from plana or information published in this magazine. 






VIDEO ELECTRONICS 



DAVID LACHENBRUCH 
CONTRIBUTING EDITOR 








> -> } jM 




MONITORS FOR 
THE HOME 



The day when the output of a home video device must be placed on an RF carrier for 
playing through a TV set may be rapidly drawing to a close, as more TV set manufac- 
turers add video input jacks to their products. Sony's Profeel video components have 
been widely publicized, as has RCA's 19-inch Monitor Receiver (see jack-panel in left- 
hand photo), but video jacks are creeping into many more home-TV sets with screen 
sizes from 3.7 to 25 inches. Among those now featuring video input jacks in at least 
one TV model in addition to RCA and Sony are General Electric, JVC, Liberty, 
Magnavox, Panasonic, and Toshiba, as well asTeknika (1633 Broadway, New York, NY 
10019). which, like Sony, has introduced a component video system. 






SLIPPED DISC Introduction of the third videodisc system — the JVC-developed VHD (see right hand 

photo above) — has been postponed for six months to April in Japan and June in the 
United States, Originally scheduled for introduction here in January, and October 1 980 
in Japan, VHD was called back because of problems arising at high temperatures in 
the compound used to manufacture the discs, according to JVC officials in Japan, JVC 
said the problems have been solved, and the tool-up period for introducing the new 
disc compound will be used to redesign the players so they can play discs recorded in 
any color-TV standard. When introduced, according to JVC, an NTSC player will be 
able to play back a PAL or a SECAM disc, and so forth. 



STEREO 
VIDEOCASSETTES 






MORE DISCS ON 
THE WAY 



8 

z 
o 



o 



o 



Although only one VCR on the U.S. market can play or record in stereo— Akai's high- 
end model — MVC (Magnetic Video Co.), the world's biggest source for pre-recorded 
videocassettes is quietly recording stereo soundtracks on all video programming (in- 
cluding movies) which is available in stereo. For the time being, this fact is not men- 
tioned by MVC in its advertising or on the cassette album oovers, but the oompany is 
preparing for the onslaught of stereo-sound VCR's that could start late this year. 

In Japan, where stereo sound is being broadcast on TV, stereophonic VCR's are 
widely available. The compatible stereo system used on Japanese VCR's could easily 
be used here, and probably will. It's a good guess that stereo sound could be the high- 
end VCR feature for 1983. 



Both videodisc systems may well float or sink on the availability of discs, and propo- 
nents of both concede there aren't enough titles on the market now. At press time, there 
were 125-150 titles available for each system, not enough of an attraction when you 
consider there are at least 3,000 titles available to the consumer on videocassette. 
However, this shortage is beginning to ease. There are now two plants stamping out LV 
discs — the original DiscoVision Associates factory in California, now joined by the 
massive Universal Pioneer plant in Japan, scheduled to be producing 200,000 discs 
monthly by the end of this year and with a capacity of 5,000.000 for 1982. And before the 
year is over, 3M is scheduled to be pressing LV discs in a Wisconsin facility. 

In the CED camp, RCA has increased its disc-production estimate for 1981 to 3,000,000 
from 2,000,000 and is expanding its Indianapolis plant to support a 10,000,000 level in 
1982. RCA is now custom-pressing the first 20 CBS/MGM videodiscs, and CBS's own 
CED disc plant is scheduled to be in operation next January. 



Facts from Fluke on low-cost DMM's 



Our new 4%-digit bench/portable: 
You've never seen anything like it. 



Take a close look at the face of this 
instrument. Notice anything new? If 
you just realized you've never seen 
words on a low-cost DMM display 
before, you're on the right track. 

This is the new 8050A from Fluke, 
the lowest priced 4 1 /a-digit multimeter 
available that uses microprocessor 
technology. 

The legends on the LCD are 
clues to what makes the 8050A 
unique. 

dB: You're right. The 8050A 
delivers direct readouts in dBm, 
referenced to any of 16 impedances. 
Use the "REF Z" button to scroll 
through the memory and locate 
the zero dBm reference you need, 



then set it and forget it. No more 
tedious calculations or conversions. 

REL: For relative references in the 
ilK mode or offset measurements in all 
other functions. Lets you store any 
input as a zero value against which all 
others are automatically displayed as 
the difference. Another timesaving 
convenience. 

HV: Just a reminder when your in- 
put is over 40V, so you won't forget about 
safety while in the dB or relative modes. 

Of course there's much more to the 



8050A. True RMS measurements to 
50 kHz. Conductance for measuring 
resistance to 100,000 Megohms and 
leakage in capacitors, pcb's, cables and 
insulators. Diode test, 0.03% basic dc 
accuracy and full input protection. 
Plus a large family of accessories. Just 
$369 U.S. 

For all the facts on the versatility 
and value of the new 8050 A, call toll free 
800-426-0361; use the coupon below; 
or contact your Fluke stocking dis- 
tributor, sales office or representative. 



[FLUKEl 




5 




l J ! ! r 



IN EUROPE: 



Fluke (Holland) B.V. 
P.O. Boi 5053. 50O4 EB 
Tilburg, The Netherlands 
(013)673 973 
Teles: 52237 



O Please send 8Q50A specifications. 

□ Please send all the facts on Fluke 

low -cost DMM's, 

O Please have a salesman call. 



KE-U/S1 



Title 


Mail Stop 




Company 


Address 


City 


State 


Zip 



Telephone | 



Ext. 



For technical data circle no. 43 



WHAT'S NEWS 



Small business computers 
to follow economy line 

Business computers priced 
under 520,000 will show a high- 
er rate of growth between now 
and 1984 than any other seg- 
ment of the business computer 
line, according to Venture De- 
velopment Corp.. a market re- 
search concern of Wellesley, 
MA. Shipments of those sys- 
tems, says VDC. will increase 
35.5% annually, accounting for 
45% of shipments by 1984. Sys- 
tems priced between $20,000 
and $50,000 will increase by 
26% annually, amounting to 
35% of the market, and those 
between $50,000 and $100,000 
are expected to increase about 
27% each year, holding 20% of 
the market in 1984. 

According to Karen Horowitz, 
VDC analyst, future technologi- 
cal advances, lower-priced 
printers, and less expensive 
storage devices will enable the 
owner of one of the lower-priced 
computer setups to obtain the 
performance of today's middle- 
priced systems. 

Home satellite TV well 

under $4,000 

Downlink, Inc., of Putnam, CT. 
has announced a reduction of 
its home-satellite TV system to 
$3595.00. "the lowest price in 



the industry.'' At the same time, 
the company announced ex- 
panded production capabilities 
and a distributor program aimed 
at marketing a thousand systems 
a month. 

The system includes a 12-foot 
spherical antenna, a low-noise 
amplifier, the Downlink model 
D2X receiver, and all of the re- 
quired cabling. 

Downlink introduced other 
models and combinations, in- 
cluding the model D-2S and 
model D-3 receivers, as well as 
the Skyview III parabolic anten- 
na, at the Chicago Consumer 
Electronics Show that was held 
last June. 



Information, control: 
1995 market leaders? 

The growth of home informa- 
tion services, video, and con- 
trol electronics will completely 
alter the face of the consumer 
electronics industry by 1995. 
The market, now $7.8 billion an- 
nually, will reach $28 billion by 
1995. Thus believes Venture De- 
velopment Corp., of Wellesley, 
MA. The home electronics field, 
once dominated by radio, and 
now getting most of its revenue 
from television, will find itself 
chiefly involved with the hard- 
ware and software of home in- 
formation services, says the 




Massachusetts market research 
firm. 

The key challenge facing 
manufacturers will be to orches- 
trate product development and 
introduction to coincide with 



evolving consumer demand, 
says Venture Development. Cor- 
rect calculation of consumer 
demand, and especially the 
timing of a product's introduc- 
tion, will be critical. 



Laser sight improves 
infrared Ihermometer 

A new handheld portable in- 
frared (IR) thermometer uses a 
laser sight for fast, precise focal- 
distance range-finding. The 
model 44L infrared thermometer 



primary concave reflector. It is 
then focused on a secondary re- 
Flector and transmitted from 
there to an IR detector. A digital 
readout is calibrated in either 
Celsius (0° to 600°) or Fahrenheit 
(0° to 1000 3 ) with 5% accuracy. 




THE TELATEMP'S LASER SIGHT not only makes focal -distance range-finding 
precise and rapid, but also facilitates temperature measurement by illuminating 
the target, a great aid under poor light or no light. 



DOWNLINK'S SKYVIEW I TV ANTENNA AND D-2 RECEIVER 



from Teiatemp, is equipped with 
a 0.5-miiliwatt laser, mounted on 
top of the basic housing. The 
laser beam is split in two. The 
primary beam is projected parallel 
to the thermometer's IR optics to 
form an intense red spot on the 
target. A secondary, more dif- 
fused beam intersects the pri- 
mary beam at the thermometer's 
preset focal distance. 

By properly aligning the two 
beams the user can measure 
the temperature of a precisely 
known area of the target. The 
illumination provided by the 
beam also aids sighting, par- 
ticularly when lighting condi- 
tions are poor or if the target is 
in darkness. 

The infrared radiation emitted 
by the target is captured by a 



Focal distances are 24 inches to 
infinity, preset at the factory. 

With laser sighting, unlike 
using rifle-type sights, the user 
can literally "shoot from the 
hip." The temperature detected 
while the trigger is depressed is 
held on the digital readout for 
the operator to read after the 
trigger is released. 



Howard Sams Phot of act s 
publishes Set No. 2.000 

The Howard W. Sams com- 
pany reached a milestone this 
past July with the publication 
of their 2000th Photofact folder. 
Sams Photofact folders first ap- 
peared in 1946. introducing a 
continued on page 12 



ODYSSEY 2 

THE EXCITEMENT OF A GAME. 

THE MIND OF A COMPUTER. 




AIL FOR THE PRICE OF 
AH ORDINARY VIDEO GAME. 

Some video games are exciting but 
short on challenge. 
Odysseyl, on the other hand, lets 

choose your excitement from 
more than 40 arcade, sports, edu- 
cation and new Master Strategy 
games that are full of challenges as 
well as fun, so they keep you coming 
back for more. 

And some video games have an abun- 
dance of brainpower, but cost an arm 
and a leg. Only Odyssey 2 includes, at no 
extra cost, a full 49-character alphabet 
and number com- 
puter keyboard 
that gives you 
access to the mind 
behind the games. 
And now there's The Quest 
For The Rings™ from Odyssey? It's 
the first in our new Master 
Strategy Series™ of video 
games that combine computer 
technology, your TV set and 
an advanced game board to 
transport you to a start! ingly 
realistic alternate world. 

Odyssey? Video game fun. 
Computer keyboard challenge. 
All for the price of an ordinary 
video game. It's waiting for you 
now, at your Odyssey* dealer. 

Odyssey 2 games Include: 

The Quest For The Rings • Speedway* 
■ Spin-Out* • Cryptc-Logic* ■ Las Vegas 
Blackjack • Armored Encounter • Sub- 
chase ■ Football • Bowling • Basketball 
■ Math-A-Magic • Echo • Computer Intro 
• Matchmaker • Logix • Buzzword • Base- 
ball • Computer Golf • Cosmic Conflict • Take 
The Money And Run • I've Got Your Number 
■ Invaders From Hyperspace • Thunderball • Show- 
down in 2001 A.D, • War Of Nerves ■ Alpine Skiing 
« Helicopter Rescue ■ Out Of This World • Hockey 
Soccer ■ Dynasty ■ Volleyball • Electronic Table Soccer 
Pocket Billiards • Pachinko • Blockout ■ Breakdown 
Casino Slot Machine * UFO • Alien Invaders— Plus. 
Included with original Odyssey 2 purchase. 

The excitement of a game. 
The mind of a computer. 



en 
m 
3) 



CIRCLE 28 ON FREE INFORMATION CARD 



Everybody^ making money 

selling microcomputers. 

Somebody s going to make money 

servicing them. 

New NRI Home-Study Course Shows You How to Make Money Servicing, Repairing, 
and Programming Personal and Small Business Computers 



8 

z 
o 






o 
a 

2 





Training includes I lit new 
TRS-80 Model [II microcompu- 
ter, 6 -function LCD Beckman multimeter, and 
the NRI Discovery Lab with hundreds of tests 
and experiments. 

Seems like every time you turn 
around, somebody comes along with a 
new computer for home or business 
use. And what's made it all possi- 
ble is the amazing microprocessor, 
the tiny little chip that's a computer 
in itself. 

Using this new technology, 
the industry is offering compact, 
affordable computers that handle 
things like payrolls, billing, inven- 
tory, and other jobs for businesses 
of every size. . .perform household 
functions including budgeting, 
environmental systems control, 
indexing recipes. And thousands 
of hobbyists are already 

owners, experimenting 
and developing their 
own programs. 
Growing 
Demand 
for Computer 
Technicians 
This is only one 
of the growth factors in- 
fluencing the increasing 
opportunities for qualified 
computer technicians. The U.S. De- 




partment of Labor projects over 100% 
increase in job openings for the decade 
through 1985. Most of them new jobs 
created by the expanding world of the 
computer. 

Learn at Home 
in Your Spare Time 
NRI can train you for this excit- 
ing, rewarding field. Train you at home 
to service not only microcomputers, but 
word processors and data terminals, too. 
Train you at your convenience, with 
clearly written "bite-size" lessons that 
you do evenings or weekends, without 
going to classes or quitting your present 
job. 

Your training is built around the 
latest model of the world's most popular 
computer. It's the amazing TRS-80™ 
Model III, with capabilities and features 
to perform a host of personal and busi- 
ness functions. No other small computer 
thas so much 
software available 
for it, no other is 



Become the 
Complete Computer Person 

You're also trained in writing and 
debugging both BASIC and advanced 
machine language programs. . . gain 
hands-on experience in the operation 
and application of computers to busi- 
ness and personal jobs. You're trained 
to become the fully rounded, new breed 
of technician who can interface with 
the operational, programming, and 
service facets of today's computers. 
You're ready to take your place in the 
new electronic age. 

Other Opportunities 

NRI has been giving ambitious 
people new electronic skills since 1914. 
Today's offerings also include TV/ 
Audio/Video Systems servicing with 
training on our exclusive computer- 
programmable 25" diagonal color 
TV... Communications Electronics for 
servicing and installing microwave, 
broadcast, CB, radar, etc... and other 
state-of-the-art courses. 




used and relied on by so many people. 
And it's yours to keep for personal or 
business use. 

You get plenty of practical experi- 
ence. Using the NRI Discovery Lab® that 
also comes as part of your course, you 
build and study circuits ranging from 
the simplest to the most advanced. You 
analyze and troubleshoot using the pro- 
fessional Beckman LCD digital mul- 
timeter you keep to use later in your 
work. Then you use the lab and meter to 
actually access the interior of your com- 
puter. . .build special circuits and write 
programs to control them. You "see" 
your computer at work and demonstrate 
its power. 



(TRS-80 is a trademark of the Radio Shack 
division of Tindy Corp.) 



Free Catalog . . . Mall Card 
No Salesman Will Call 

Send the postage-paid card for 
our 100-page catalog showing all 
courses with equipment and complete 
lesson plans. There's no obligation other 
than to yourself. See how NRI can help 
you grow with the most exciting and 
important new field of the 80's. If card 
has been removed, please write to us. 

NRI SCHOOLS 

McGraw-Hill Continuing 
Education Center 
• 3939 Wisconsin Ave. 
j | Washington, DC 20016 

We'll give you tomorrow. 




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11 



WHAT'S NEWS 



continued from page 6 



revolutionary new type of ser- 
vice information. Each piece of 
equipment described was dis- 
assembled, so that all data 
would be complete and accurate 
for the parts and circuits actually 
appearing in the equipment. 
(The "official service manuals" 
of the time — Gernsback's. Rider's, 
and Be it man's— merely reprinted 
the manufacturer's schematic, 
often with extracts from manu- 
facturers service information. 




PHOTOFACT FOLDER NO. 2000 has 
a gold cover, to mark an era in ser- 
vice information publishing. 

The Sams approach resulted 
in the Photofact Standard Nota- 
tion schematic; complete align- 
ment and adjustment instruc- 
tions; chassis and waveform 
photographs; comprehensive 
parts lists with replacement 
parts, and test measurements. 
The sequence and format of the 
information has been presented 
in the same consistent, stan- 
dardized and clear manner from 
Folder No. 1. 

Number 2,000 was reached 
with a folder containing infor- 
mation on the Hitachi NPX-L and 
the Sears 564-44150050/4200050 
color-TV receivers, and on the 
Realistic 12-1524 Chronomatic 
219 radio. The cover for this 
special set is printed in gold to 
mark the occasion. 

Initially. Photofact folders 
provided service information for 
radios; their coverage was later 
expanded to include television 
receivers, as well as a variety of 
other consumer electronics 
equipment. Recently, coverage 
has been expanded to include 
video-cassette recorders, and 



videodisc players will soon be 
covered. Currently, seven Photo- 
fact sets are published every 
month. Some technicians have 
been members of the Photo fact- 
of-the-Month Club from the 
beginning and have received all 
2000 sets. Beginning with No. 
2000 the publisher states that 
Photofacts has been updated 
and streamlined graphically. 

RCA, Columbia, uniting to 
market home video abroad 

RCA Corporation and Colum- 
bia Pictures Industries, Inc., have 
formed a joint venture to market 
home-video entertainment pro- 
grams throughout the world, 
excepting the United States and 
Canada. The participants will 
develop an organization with 
offices in all principal countries, 
to market existing and future 
theatrical and television pro- 
grams produced by the two 
companies and other producers, 



as well as original productions 
created specifically for the 
home-video market. 

Japan has a new 
weather satellite 

Japan's second weather satel- 
lite, launched last August, is 
called GMS-2 (the second Geo- 
stationary Meteorological Satel- 
lite). Its position in space is just 
south of Japan, at 140° East 
longitude, where it will replace 
GMS, launched in 1977. Its area 
of operation extends over China 
and Korea in the north, Australia 
and New Zealand in the south, 
Burma and Tibet on the east, 
and Hawaii on the west. 

The most important instru- 
ment aboard GMS-2 is a visible/ 
infrared spin-scan radiometer. It 
detects visible and invisible 
radiation from the earth and 
transmits it to ground for analysis 
by weather forecasters. The in- 
formation helps them to deter- 




THE JAPANESE GMS-2 UNDERGOES TESTS at Hughes Aircraft In El 
Segundo, CA. It will collect weather pictures from an area of some 65 
million square miles in the Western Pacific. 



mine the intensity and direction 
of storms, 

GMS-2 also provides informa- 
tion on tidal, tsunami ("tidal 
wave"), and ice conditions, by 
gathering data from sensors on 
buoys and at fixed land loca- 
tions, and relaying the data to 
ground. 

Another instrument, a Space 
Environment Monitor (SEM), 
takes measurements of energetic 
protons in space, for use in 
scientific studies. The satellite 
also supplies the usual TV-like 
images of cloud patterns. 

GMS-2 was developed and 
built by Hughes Aircraft Com- 
pany for Nippon Electric. It is 
the first U.S. -produced geo- 
synchronous satellite to be 
launched by a foreign country. 
The SEM system was built by 
Nippon Electric, which also as- 
sembled a number of the satel- 
lite's electronic units. Sharp 
Corp. of Japan provided solar 
cells for the spacecraft. 

The N-II rocket, developed in 
Japan, can carry a 350-kg [772- 
lb) geostationary satellite. It 
stands 35 meters (11 5 feet) high 
and develops 1 70,000 pounds of 
thrust with its main engine and 
nine strap-on boosters. 

Electronic mail system 

to begin in 25 cities 

The United States Postal Ser- 
vice has placed a $31-million 
contract with RCA to provide an 
Electronic-Computer Originated 
Mail (E-COM) system, to begin 
operation in 25 U.S. cities early 
in 1982. The new system will 
offer mailers high-speed delivery 
of notices, statements, and other 
computer-originated letters. 

The system will accept infor- 
mation from a customer's com- 
puter-generated magnetic tape 
or from a computer via private 
telecommunications carriers. 
This will be printed at the elec- 
tronic mail center designated by 
the customer, then entered into 
the First Class mailstream. 

Pages will be trimmed to 
BVz x 11 inches, folded and 
placed in envelopes, all auto- 
matically. The address printed 
on the letter will be displayed 
through a window in the en- 
velope, and delivery made by 
the U.S. Postal Service. R-E 



12 



Synthesized 

Hand-Held 

Scanner! 

Chances are the police, fire and weather 
emergencies you'll read about in tomor- 
row's paper are coming through on a 
scanner right now. All scanners sold by 
Communications Electronics bring the 
real live excitement of action news into 
your home or car. With your scanner, you 
can monitor the exciting two-way radio 
conversations of police and fire depart- 
ments, intelligence agencies, mobile tele- 
phones, energy/oil exploration crews, 
drug enforcement agencies and more. 

Some scanners can even monitor aircraft 
transmissions! You can actually hear the 
news before it's news. If you do not own a 
scanner for yourself, now's the time to buy 
your new scanner from Communications 
Electronics. Choose the scannerthat's right 
for you, then call our toll-free number to 
place your order with your Visa or Master 
Charge card. 

We give you excelle nt service because C E 
distributes more scanners worldwide than 
anyone else. Our warehouse facilities are 
equipped to process thousands of scanner 
orders every week. We also export scanners 
to over 300 countries and military instal- 
lations. Almost all items are in stock for 
quick shipment, so if you're a person who 
prefers fact to fantasy and who needs to 
know what's really happening around you, 
order your scanner today from CE! 

NEW! Bearcatl350 

The Ultimate Synthesized Scanner! 

Allow 30-120 days for delivery after receipt of 
order due to the high demand for this product. 
List price S599.95/CE price S419.00 

7-Band, 50 Channel • Alpha-Numeric * No- 
crystal scanner • AH Aircraft and Public 
Service bands, • Priority Channel • AC/DC 

Bands: 30-50, 118-136 AM, 144-174,421-512 MHz, 
The new Bearcaf 350 introduces an incredible 
breakthrough in synthesized scanning: Alpha- 
Numeric Display, Push a button— and the Vacuum 
Fluorescent Display switches from "numeric" to 
word descriptions of what's being monitored. 50 
channels in 5 banks. Plus, AutoS Manual Search, 
Search Direction, Limit & Count. Direct Channel 
Access. Selective Scan Delay. Dual Scan Speeds, 
Automatic Lockout. Automatic Squelch. Non-Volatile 
Memory. Reserve your Bearcat 350 today! 

Bearcat® 300 

List price S549.95/CE price $349.00 
7-Band, SO Channel • Service Search • No- 
crystal scanner • AH Aircraft and Public 
Service bands. * Priority Channel • AC/ DC 

Bands: 32-50, 1 18-1 36 AM, 144-174, 421-512 MHz, 
The Bearcat 300 is the most advanced automatic 
scanning radio that has ever been offered to the 
public. The Sea re a f 300 uses a bright green fluo- 
rescent digital display, so it's ideal for mobile 
applications. The Bearcaf 300 now has these added 
features: Service Search, Display Intensity Control, 
Hold Search and Resume Search keys, Separate 
Band keys to permit lock-in/lock-out of any band for 
more efficient service search. 



Bearcat® 250 

List price S429.95/CE price $279.00 
O-Band, 50 Channel • Crysialless • Searches 
Stores • Recalls e Digital cfocfc • AC/DC 
Priority Channel • Delay • Count Feature 

Frequency range 32-50, 146-174, 420-512 MHz 
The Bearcat 250 performs any scanning function you 
could possibly want. With push button ease you can 

program up to 50 channels for automatic monitoring. 
Push another button and search for new frequencies. 
There are no crystals to limit what you want to hear. A 
special search feature of the Bearcaf 250 actually 
sto res 64 f req u enci e s a nd recal I s t he m, on e at a t i me, at 
your convenience. 

NEW! Bearcat® 20/20 

Allow 30-60 days tor delivery after receipt of 
order due to the high demand for this product. 
List price S449.95/CE price $289.00 
7-Band, 4Q Channel e Crystatless • Searches 
AH Aircraft and Public Service bands * AC/DC 
Priority Channel e Direct Channel Access * Delay 
Frequency range 32-50, 1 IB- J 36 AM, 144-174, 420-S12 MHr 

The Bearcat 20/20 automatic scanning radio 
replaces the Bearcat 220 and monitors40 frequen- 
cies from 7 bands, including aircraft. A two-position 
switch, located on the front panel, allows monitoring 
of 20 channels at a time. 

Bearcat® 21 0XL 

List price S349.95/CE price 5229.00 

a-Band, 10 Channel • Crystatless • AC/ DC 

Frequency range; 32-50, 144-174, 421-512 MHz. 
The Bearcat 2 1 0XL scanning radio is the second gener- 
ation scanner that replaces the popular Bearcat 210 
and 21 1. It has almost twice the scanning capacity of 
the Bearcat 210 with 18 channels plus dual scanning 
speeds and a bright green fluoresceni display. Auto- 
matic search finds new frequencies. Features scan 
delay, single antenna, patented track tuning and more! 

Bearcat® 160 

List price S299.95/CE price $1 89.00 

5- Band, 16 Channel • AC only • Priority 

Dual Scan Speeds • Direct Channel Access 

Frequency range: 32-50, 144-174, 440-512 MHz. 
Would you beiieve,..the Bearcat 1 60 is the least 
expensive Searcaf crystalless scanner. 

This scanner presents a new dimension in 
scanning form and function. Look at the smooth 
keyboard. No buttons to punch. No knobs to turn. 
Instead, finger-tip pads provide control o( alt scanning 
operations, including On/Off, Volume and Squelch. Of 
course the Bearcaf 160 incorporates other advanced 
Searca f f eatu res s uch as P riority, Direc t Ch an nel Access, 
Dual Scan Speeds, Lockout, Scan Delay and more. 

NEW/ Bearcat® 100 

The lirst no-crystal programmable handheld scanner. 

Allow 60-180 days for delivery after receipt of 
order due to the high demand for this product. 
List price S449.95/CE price S299.00 
8- Band, 16 Channel e Liquid Crystal Display 
Search * Limit • Hold * Lockout ■ AC/DC 
Frequency range: 30-50, 138-174, 406-512 MHz 
The world's first no-crystal handheld scanner has 
compressed into a 3 ,r x 7" x 1 'A" case more scanning 
power than is found in many base or mobile scanners. 
The Bearcat 100 has a full 16 channels with frequency 
coverage that includes all public service bands (Low, 
High, UHF and "T" bands), the 2-Meter and 70 cm. 
Amateur bands, plus Military and Federal Government 
frequencies, it has chrome-plated keys for functions 
that are user controlled, such as lockout, manual and 
automatic scan. Even search is provided, both manual 
and automatic. Wow...what a scanner! 

The Bearcat 1 00 produces audio power output of 300 
milliwatts, is track-tuned and has selectivity of better 
than 50 dB down and sensitivity of O.S microvolts on 
VH F and 1 .0 microvolts on UH F. Power consumption is 
kept extremely low by using a liquid crystal display and 
exclusive low power integrated circuits 

IncludedinourlowCE price is a sturdy carrying case, 
earphone, battery charger/AC adapter, six AA ni-cad 
batteries and flexible antenna. For earliest delivery 
from CE, reserve your Bearcat 1 00 today. 



Bearcat® 5 



Fanon Slimline 6-HLU 

List price SfG9 r 95/CE price $109.00 
Low coal G-chnnnol, 4- band scanner* 

The Fanon Slimline 8-HLU gives you six channels of crystal 
controlled excitement. Unique Automatic Peak Tuning Circuit 
adjusts the receiver front end for maximum sensitivity 
across the entire UHF band. Individual channel lockout 
switches- Frequency range 30-50, 146-175 and 45-0-512 
MHz, Size 2% x6V* x 1" Includes rubber ducky antenna. 
Order crystal certificates far each channel. Made in Japan. 

Fanon Slimline 6-HL 

List price S149.95/CE price 599,00 

S-Channol portormance at 4-channmi coat! 

Frequency range: 30-5Q, 146-175 MHz. 

If you do""? need the UHF band, get Ibis model and save 

money. Same high performance and features as the model 

HLU without the UHF band- Order crystal certificates for 

each channel. Made in Japan. 

FANON SCANNER ACCESSORIES 

SCMA-6 Mobile Ada pier/ Battery Charger $49.00 

CHB-6 AC Ada pier/ Battery Charger 515.00 

CAT-6 Carrying case for Fanon w/Belt Clip $1 5.00 

AUC-3 Auto lighter adapter/ Battery Charger $15-00 

PSK-6 Base Power Supply/Bracket for SCMA-6 . . , S20.GQ 

OTNER SCANNERS & ACCESSORIES 

Regency"* M400 Scanner $259.00 

Regency* M100 Scanner. £199-00 

Regency* R1 040 Scanner. $149.00 

SP50AC Adapler $9.00 

SP51 Battery Charger £9.00 

SPSS Carrying Case for Bearcaf 4-6 ThinScan" . . . $ f 2.00 

FB-E Frequency Directory for Eastern U.S.A. £1 2.00 

FS-W Frequency Directory for Western U.S. A $12.00 

FFD Federal Frequency Directory for U.S.A. £1 2.00 

B-4 1.2 V AAA -Mi-Cads for ThinScan" and Fanon ...$9.00 

A-1 35cc Crystal certificate $3-00 

Add $3.00 shipping for all acce ssotisa ordered at the same time. 

INCREASED PERFORMANCE ANTENNAS 

If you want the utmost in performance from your 
scanner if is essential that you use an external antenna. 
We have six base and mobile antennas specifically 
designed for receiving all bands. Order #A6Q is a 
magnet mount mobile antenna. Order #A61 is a gutter 
clip mobile antenna. Order #A62 is a trunk-lip mobile 
antenna. Order #A63 is a ¥* inch hole mount. Order 
# A64 Is a ^ inch snap-in mount, and#A70 is an all band 
base station antenna. All antennas are $35.00 and 
S3.00 for UPS shipping in the continental United States. 

BUY WITH CONFIDENCE 

To get the fastest delivery from CE of any scanner, 
send or phone your order directly to our Scanner 

Distribution Center!" Be sure to calculate your price 
using the CE prices in this ad. Michigan residents 
please add 4% sales tax. Written purchase orders are 
accepted from approved government agencies and 
most well rated firms at a 10% surcharge for net 10 
billing. All sales are subject to availability. All sales on 
accessories are final. Prices, terms and specifications 
are subject to change without notice. Out of stock items 
wilt be placed on backorder automatically unless CE is 
instructed differently. Most products that we sell have a 
manufacturer's warranty. Free copies of warranties on 
these products are available prior to purchase by 
writing to CE. International orders are invited with a 
£20.00 surcharge for special handling in addition to 
shipping charges. All shipments are F.O.B. Ann Arbor, 
Michigan. No COD's please. Non-certified and foreign 
checks require bankclearance. Minimum order $35 .00. 
Mail orders to: Communications Electronics' 
Box 1002, Ann Arbor, Michigan 48106 U.S.A. Add 
S7.00 per scanner or phone product for U.P.S. 
ground sh ipping and handling, or $1 4.00 for faster 
U.P.S. air shipping to some locations. If you have a 
Master Charge or Visa card, you may call anytime 
and place a credit card order. Order toll free in the 
U.S.A. Dial 800-521-4414. If you are outside the 
U.S. or in Michigan, dial 313-994-4444, Dealer 
Inquiries Invited. All order lines at Communi- 
cations Electronics" are staffed 24 hours. 
Scanner Distribution Center" and CE logos are trade- 
marks of Communications Electronics" 
t Bearcat is a federally registered trademark of Electra 
Company, a Division of Masco Corporation of Indiana. 
X Regency is a federally registered trademark of Regency 
Electronics Inc. 
Co pyrig ht °1 981 Communications Electronics" 




NEW! Bearcat* 350 



List price S134.95/CE price S94. 00 

4-Band, 6 Crystal Channels ■ Lockout (AC only 

Frequency range: 33-50, 146-174. 450-508 MHz 
The Searcaf 5 is a value-packed crystal scanner built for 

the scanning professional — at a price the first-time 
buyer can afford. Individual lockout switches. Order one 
crystal certificate for each channel. 

Bearcat® Four-Six ThinScan™ 

List price St89.95/CE price S1 24.00 
Frequency range: 33-47, 152-164, 450-508 MHz 
The incredible, Bearcat Four-Six Thin Scan" is like 
having an information center in your pocket. This four 
band. 6 channel crystal controlled scanner has patented 
Track Tuning on UHF. Scan Delay and Channel Lockout. 
M easu res 2 % x 6 V* x 1 " I n cl udes ru bber d ucky a nt e n na. 
Order crystalcertificate for each channel. Madein Japan. 

TEST ANY SCANNER 

Test any scanner purchased from Communications 

Electronics" for 31 days before you decide to keep It. If for 
any reason you are not completely satisfied, return it in 
original condition with all parts in 31 days, for a prompt 
retund (less shipping/handling charges and rebate credits). 

CIRCLE It ON FREE INFORMATION CARD 




master charge 



e 



COMMUNICATIONS 
ELECTRONICS" 

S54 Phoimil □ Bo* 1002 D Ann Arbor, Michigan 40 1 06 U.S.A. 
Call TOLL- F REE 1*00) 52 1 44 1 . or aul»l Sa U. S.A I J 1 J) IH-4444 

We're first 
with the best? 



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13 



NOVEMBER 



fi ?JB7W! ■■j ^ J 



New Portable Digital 
Capacitance Meter 




MODEL 820 
Call For Our Price 



SUHITAOHI 



KEITHLEY 




Non-Linear Systems 



IFLUKEI 



VIZ 



noji 



HICKOK 



TRIPLETT 



PHILIPS 



£3 



WESTON 



} 4€ PRECISION 



LEADER 



DORIC 



DATA PRECISION 




to 
o 

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is 

3 

LLI 

6 

Q 

14 



s 



THE TEST EQUIPMENT 
SPECIALISTS 

TOLL FREE HOT LINE 

800-223-0474 



54 WEST 45th STREET, NEW YORK, NY. 10036 
IN NEW YORK STATE 212-687-2224 



KEITHLEY 



Model 169 
BENCH/PORTABLE DMM 

• 3V* Digit liquid crystal 

display 

• 0.25% basic accuracy 

• 26 Ranges 

$189.00 




£E\E D 



80MHz Counter with Period Function 

MODEL 1820 

* 5Hz to 80MHz reading guaranteed— 
100MHz typical 

* Period measurements from 5 Hi 
to 1 MHz 

* Period average, auto and manual 

positions 

* One PPM resolution 

* Totalizes to 999999 plus overflow 

* Elapsed time measurements from .01 
to 9999. 99 seconds plus overflow 

* One*megohni Input resistance 
Call For Our Price * B " 9hc " 43 " h|flh LED readoiJls 




New Low Distortion Function Generator 



SfCPMCISION 




MODEL 3010 

• Generates sine, square and triangle 
wavelorms 

• Variable amplitude and fixed TTL square- 
wave outputs 

• 0.1 Hz to 1 MHz in six ranges 

• Push button range and function selection 

• Typical sing wave distortion under 0.5% 

Irom 0.1Hz to fOOkHz 

• Variable DC offset lor engineering 
applications 

• VCO external input for sweep -frequency 
tests 



New Sweep/Function Generator 

MODEL 3020 



SftPRlCIStOH 




• Four instruments in one 
package— sweep generator, lunc- 
lion generator, pulse generator, 
tone-burst generator. 

> Covers G.02Hz-2MHz 

■ 1000: 1 tuning range 

• Low -distortion high-accuracy 
outputs 

• Three-step attenuator plus 
vernier control 

• Internal linear and log sweeps 

• Tone-burst output is Iront-panel or 

externally programmable 



V-151B 15 MHz Single Trace 
V-152B 15 MHz Dual Trace 
V-202 20 MHz Dual Trace 
V-301 30 MHz Single Trace 
V-302B 30 MHz Dual Trace 
V-352 35 MHz Dual Trace 
V-550B 50 MHz Dual Trace, 

Dual Time Base 
V-1050 100 MHz Dual Trace, 

Dual Time Base 



0HITACHI 



Call For 

Special Intro 

Price Offer 




We carry a full line of multimeters, oscilloscopes, frequency counters, audio and 
RF generators, power supplies and accessories. 

Just ca!l our Toil-Free number and one of our experts will answer all your 
questions about test equipment. 



THESE 1981 B&K OSCILLOSCOPES 

ARE IN STOCK AND AVAILABLE 

FOR IMMEDIATE DELIVERY 




'i§€PRECISION 



1479A Dual-Trace 

1477 Dual-Trace 

1432 Dual-Trace 

1476 Dual-Trace 

1466 Single-Trace 

1405 Single-Trace 
1420 Dual-Trace 

CALL FOR OUR 
EARLY BIRD SPECIAL LOW PRICE 



30 MHz 
15 MHz 

15 MHz Portable 
10 MHz 
10 MHz 
5 MHz 
15 MHz Portable 



PORTABLE 
OSCILLOSCOPES 



MS-15 



BATTERY OPERATED 



Nor- Linear Systems 




Call For Our Prices 



MS-215 



Single Trace 15MHi 
MS-230 




Dual Trace 15 MHz 




Dual Trace 30MHz 



I FLUKE I DIGITAL MULTIMETERS 



Model 8022B: 

The Troubleshooter 



$139 



• Six functions • avj-digir resolution 
dc voltage 

ac voltage * 0.25% basic dc accuracy 

dc current • LCD dispfay 

ac current 

resistance * Overload protection 

diode tesi 



Model 802DB 

The Analyst 



Model 6024A: 
The Investigator 




• Seven functions 

dc voHage 
ac voltage 
dc current 
ac current 
resistance 
diode lest 
conductance (1/R) 

• 3Vj-dfgU resolution 

• Q.1% basic dc accuracy 

• LCD display 

■ Overload prelection 

• Two year parts 
and labor warranty 



• Nine functions 
dc voltage 
ac voltage 
dc currenl 
ac current 
resistance 
diode test 
conductance [1 iR) 
logic level and 

continuity detect 
temperature (K-type 

ibermocoupie) 



• Peak hold on voltage 
and current functions 

• Selectable audible 
indicator for 
continuity 

or level detection 

* 3Vj-digit resolution 

* 0.t% basic dc accuracy 

* LCD display 

• Overload protection 



KEITH LEY 



MODEL 130 
DIGITAL MULTIMETER 



RANGE 



ACCURACY 



DC VOLIAUL- 


200m V, 2V, 20V, 200V, 1000V 


.5% 


AC VOLTAGE 


200mV, 2V, 20V, 200V, 750V 


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2mA, 20mA, 200mA, 2000mA, 10A 


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RESISTANCE 


200ft 2kQ, 20kQ, 200kQ, 20M Q 


.5% 



CALL US 

FOR OUR 

FALL 

SPECIALS! 



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15 



EDITORIAL 



Just Another Technological Advance? 



Electronics technology plays a vital role in almost every industry. 
Every day, in medicine and energy conservation, to name just two, 
electronics is making an important and continuing contribution. 

One industry greatly changed and influenced by electronics is 
photography. The portable alt-in-one video camera/VCR combina- 
tion is encroaching upon and often replacing home-movie camera/ 
projector/screen combinations. Photographic still-picture cameras 
have also felt the impact of electronics. Integrated circuits have 
made possible such features as automatic exposure, LED 
metering, and even auto-focusing. 

Now Sony has announced the all-electronic still camera. Called 
the MAVICA (MAgnetic Wdeo CAmera}, it looks very much like a 
conventional 35-mrm SLR. It weighs 1 3 /4 lbs. and measures 57b x 
3V2 x 2V16 inches. It is a single-lens reflex camera with inter- 
changeable lenses. Shutter speeds range from 1/60 to 1/1000 on 
manual and 1/60 to 1/2000 on automatic. 

Here the similarity ends. The MAVICA does not use photographic 
film. Instead, it uses a CCD image sensor with about 280,000 
picture elements (570 horizontal and 490 vertical). The images 
are recorded on a magnetic disk that rotates inside a flat cassette 
(very much like a floppy disk). The magnetic cassette sits inside 
the camera and records up to 50 color pictures. Pictures can be 
selectively erased and re-recorded. 

To see the pictures you've taken, the cassette is removed from 
the camera and placed into a viewer that is connected to a TV 
set. A transmitter/receiver combination will be available that 
attaches to the viewer. With this, pictures can be transmitted 
over telephone lines. In addition, the camera provides output 
signals for direct connection to a VCR. Now when the camera is 
switched to a continuous mode, it becomes a video camera. 

Specifications include a 1-MHz bandwidth, an image S/N ratio 
of 45 dB and a horizontal resolution equivalent to 350 TV lines. 
The price of the camera will be around $650 and the viewer about 
$230. Each magnetic cassette is expected to sell for $2.65. 

Commercial introduction is scheduled for the fall of 1983. 
Although I haven't seen any pictures from this camera, Sony 
claims that they are somewhat disappointed in the picture quality 
and resolution. However, they are working feverishly to improve 
the quality before introduction. Sony is also working on a hard- 
copy color printer for the system. 

Although this latest development won't have a profound effect 
on our day-to-day lives, it is one more reason why I feel proud 
to be a member of the electronics industry. It also prompts me 
to ask why this, like so many other recent advances, comes from 
abroad instead of from our own research and development labs? 




ART KLEIMAN 

Managing Editor 



Electronics 




Hugo Gems back (1884-1967) founder 

M. Harvey Gernsback, editor-in-chief 

Larry Sleekier. CET. publisher 

Arthur Kleiman, managing editor 

Josef Bernard, K2HUF, technical editor 

Carl Laron, WB2SLR. assistant editor 

Jack Darr, CET. service editor 

Leonard Feldman 
contributing high-fidelity editor 

Kari Savon, semiconductor editor 

Herb Friedman, communications editor 

Gary K Arlen, contributing editor 

David Lachenbruch, contributing editor 

Earl "Doc" Savage, K4SDS, hobby editor 

Ruby Yee, production manager 

Robert A, W. Lowndes, production 
associate 

Joan Burwick, production assistant 

Gabriele Margules, circulation director 

Arline R. Fish man, 
advertising coordinator 

Cover photo by Robert Lewis 

Radio-Electronics is indexed in Applies 
Science & Technology Index and Readers 
Guide to Periodical Literature. 



Gernsback Publications. Inc. 
200 Park Ave. S., New York. NY 10003 
President: M. Harvey Gernsback 
Vice President: Larry Sleekier 
Secretary /Treasurer: Carol A. Gernsback 

ADVERTISING SALES 212-777-6400 

Larry Steckler 

Publisher 

EAST 

Stanley Levitan 
Radio-Electronics 
200 Park Ave. South 
New York. NY 10003 
212-777-6400 

MIDWEST/Texas/Arkansas/Okla. 

Ralph Bergen 

The Ralph Bergen Co. 

540 Frontage Road — Suite 361-A 

Northfield, Illinois 60093 

312-446-1444 

PACIFIC COAST 
Mountain States 

Marvin Green 
Radio-Electronics 
413So. LaBreaAve. 
Los Angeles. Ca 90036 
213-938-0166-7 

SOUTHEAST 

Paul McGinnis 

Paul McGinnis Company 

60 East 42nd Street 

New York, N.Y. 10017 

212-490-1021 




16 



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CIRCLE 78 ON FREE INFORMATION CARD 



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NTS HOME TRAINING INVITES YOU TO EXPLORE MICROCOMPUTERS, 
DIGITAL SYSTEMS AND MORE, WITH STATE OF THEART EQUIPMENT 
YOU ASSEMBLE AND KEEP 



Without question, microcomputers are the 
state of the art in electronics. And NTS is the 
only home study school that enables you to 
train for this booming field by working with 
your own production-model microcomputer. 

We'll explain the principles of trouble- 
shooting and testing your microcomputer and, 
best of all, we'll show you how to 
program it to do what you want. 

You'll use a digital multimeter, a 
digital logic probe and other 
sophisticated testing 
gear to learn how to 
localize proble 
and solve 
them 



Send for the full color catalog in the elec- 
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advantages of home study with NTS! 

NTS also offers courses in Auto Mechanics, 
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We 

believe 
that training 
on production- 
model equipment, 
rather than home-made learning devices, 
makes home study more exciting and rele- 
vant. That's why you'll find such gear in most 
of NTS's electronics programs. 

For instance, to learn Color TV Servicing 
you'll build and keep the 25-inch (diagonal) 
NTS/HEATH digital color TV. 

In Communications Electronics you'll be 
able to assemble and keep your own 
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equipment. 

But no matter which program you choose, 
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unit 4K RAM. expandable. 2. The NTS/KIM-1 
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calculator- type keyboard. A 6502 based 
microcomputer with IK RAM, expandable. 
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Auto Mechanics 
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21 



SATELLITE/TELETEXT NEWS 



GARY ARLEN 

CONTRIBUTING EDITOR 



CAJTTM STATIC** MCCtEVIR 




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NEW TVRO 
EQUIPMENT 



Blonder-Tongue Laboratories has introduced its first TVRO earth-station devices, in- 
tended especially for the master-antenna TV market (see left-hand and center photos 
above); it includes three antenna systems (3, 3.65, and 4.6 meters), three low-noise 
converters, and receiving equipment. B-T*s new LNC's (Low-Woise Converters) allow 
satellite signals to be carried from the antenna to the receiver over UHF-type coaxial 
cable. The LNC is a combination low-noise amplifier and block downconverter and is 
mounted directly on the antenna. Satellite signals from the LNC are low-noise ampli- 
fied, and the entire 500-MHz band is block-converted down from 3.7- to 4.2-GHz. to 
frequencies in the 270- to 770-MHz range for input to the rece'ver, (Blonder-Tongue 
Labs. One Jake Brown Road, Old Bridge. NJ 08857.) 

Downlink Inc. has developed a $2650 EP-2000 Electronics Package that includes 
everything for a TVRO except the antenna. The equipment group includes remote- 
control console, 120° LNA. RF modulator, and cabling. In addition. Downlink is selling 
a Skyview I system for $3595, a package of devices which includes a 12-foot parabolic 
antenna. The firm also has a new Skyview III modular fiberglass parabolic antenna. 
(Downlink Inc., 30 Park St.. Putnam, CT 06260.) 






SATCOM lll-R 

READY FOR 

LAUNCH 



RCA Americom is completing plans for the launch of Satcom lll-R (see right-hand 
photo above), the 24-transponder bird that will become the primary satellite for cable- 
TV programming. Satcom lll-R will be placed in geosynchronous orbit at 132* West 
longitude, and will, in general, have transponder assignments identical to the current 
assignments on Satcom I, which is currently RCA's CableNet One satellite. The 2385- 
pound satellite, which replaces the bird that was lost in space shortly after launch in 
December 1979, was scheduled for launch in October aboard a Delta 3910/PAM-D 
rocket. Satcom lll-R's footprint will cover all 50 states. 









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COMING UP 



USA Network and Home Box Office, both carried aboard Satcom I. are joining the 
trend toward 24-hour-per-day programming. USA Network was scheduled to begin 
fufl-time transmission in October, and add three new series, "Better Homes and 
Gardens Idea Notebook," "Scholastic Sports Academy" and "The Wall Street Journal 
Evening News." HBO will expand to 24-hour daily service on January 1. after Satcom 
lll-R is in place. At that time, HBO will shift its western time-zone feed to transponder 13 
on the new satellite. 

Satellite Syndicated Systems, which now transmits Satellite Program Network on 
Westar 111 transponder 9 and retransmits Superstation WTBS on Satcom I, has taken 
lifetime leases on three transponders on Southern Pacific Communications' hybrid 
Spacenet I satellite, due to be launched in 1984. SSS's lease on Spacenet calls for 
three fully protected 36-MHz transponders for the life of the satellite. The programming 
will probably be some form of special interest shows. 



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ANADEX DP-9500/9501 $1249 

TELEVIDE0 912C $ 669 

TELEVIDEO920C $ 729 

TELEV1DEO950 $ 929 

CBM 8032 COMPUTER $1149 

CBM 8050 DISK DRIVE $1349 

CBM 4032 COMPUTER $1029 

CBM 4040 DISK DRIVE $1029 

CBM 4022 $ 649 

CBMVIC-20 $ 269 

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LEEDEX^AMDEK COLOR-1 13" Color 
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CIRCLE 70 ON FREE INFORMATION CARD 



LETTERS 



TELEVISION MODULATION 

In reference to two letters you pub- 
lished on television modulation (Mr. 
Davis, January 1981: Mr. Rogers, May 
1981): Neither letter is correct, although I 
would give Mr. Rogers credit for coming 
close. 

Mr. Rogers stated that tip of peak sync 
is 100% modulation. That is incorrect. Tip 
of sync is 100% of peak carrier level, 
which is also 0% modulation. Thus, 100% 
of peak carrier level corresponds to 0% 
modulation and -40 IRE units; 75% of 
peak carrier level (blanking level) cor- 
responds to 25% modulation and IRE 
units: 12,5% of peak carrier level (refer- 
ence white) corresponds to 87,5% modu- 
lation and +100 IRE units, and 0% of peak 
carrier level (carrier cutoff) corresponds 
to 100% modulation and +120 IRE units. 
Increasing depth of modulation of the 
luminance signal beyond 87.5% (i.e., be- 
low 12.5% of the peak carrier level) is 
prohibited by FCC regulations. That's 
Title 47 CFR, Section 73,682 (a) (13), in 



case you're interested, 

Mr. Rogers properly points out the con- 
fusion between the IRE scale (which runs 
from to -40 IRE units and to +120 IRE 
units, with being clamped at the blanking 
level), and the percent scale. However, 
one must also differentiate between per- 
cent of peak carrier level and percent 
modulation; they are complements of 
each other. 

Mr. Roger's comments on television 
output power are well taken. For an all- 
black picture, the ratio of peak power to 
average power for an NTSC system M 
television signal is 1 .68 to 1 ; but for an all- 
white picture the ratio is different; it 
changes to 5,99 to 1, 
DANE E, ERICKSEN, 
FCC Field Operations Bureau, 
San Francisco, CA 

"ILLEGAL" DEVICES 

In response to D.T. Horn's letter in the 
June Radio- Electronics, wherein he de- 
plored the manufacture and possession 



of devices like radar detectors and pay-TV 
decoders, I wonder if he would also in- 
clude VCR's that can play back a tape 
without generating royalties. And what 
about "commercial-killer'' devices? Once 
you start on that kind of list, it's hard to 
stop. 

Yes — probably some rules do need 
changing. But where some rule-changes, 
like baseball's "designated hitter" rule, 
are intended to enhance the game, others 
are just "oh-poor-me" reactions, like 
casinos excluding card-counters (dear 
me, they're likely to win!) or restrictions 
on imported cars. 

Not that we should all be lawyers, but 
perhaps Radio- Electronics can keep us 
posted on these interminable issues. 
ALEX ESTEVE 

THE "FREEDOM PHONE" 

I just finished the July 1981 issue of 
Radio-Electronics and was, of course, 
pleased to see the cordless-phone cover 
feature with the inclusion of material 



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PRESENTS 




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High performance 

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$580 

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A quality scope, 
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Hameg introduces high performance at low coil in the HM 203, a full featured, highly reliable, dual trace 
2D MHz oscilloscope For only S5S0, ihe HM 203 has specifications normally associated with higher priced 
scopes. Bandwidth - DC-»20 MHz • Risetime 17.5 ns • Overshoot 196 mas. • Y amp range 5 mv/cm to 
20 v/cm • Max. input voltage 500V • Timebase .5 ss/cm to ,2s /cm • Sweep mag, x5 • Trigger 5 Hz to 
30 MHz • X:Y plot • Buill-in probe calibrator and more. Its sturdy construction and light weight f 1 3.2 lbs. J 
make the HM 203 equally at home in the field and on the test bench. 

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88-90 Harbor Rd. 

Port Washington, N.Y„ 11050 

Tet C518) 883-3837 



about Electra's "Freedom Phone." 

However, there's a technical error in the 
storythatneedscorrection.lt is absolutely 
not true that "Freedom Phone" cordless 
phones use "one channel in the 49-MHz 
band,..". That implies, of course, that 
Electra's phones are of the low-cost sim- 
plex variety. Not true! Electra uses 1.7 
MHz and 49 MHz for its "Freedom Phone" 
phones, just like all other full-duplex sys- 
tems on the market. 

The big news we've been trying to tell is 
the development of a brand new cordless 
phone with full-duplex operation within 
the 49-MHz band using two frequencies. 
The significance of that breakthrough is 
that it eliminates the limitations of 1.7 MHz 
in terms of range and noise. That techno- 
logical feat was totally lost in the story, I'm 
afraid. 

ROBERT A, HANSON, Vice President, 
MicKinney/Mid America 

SUBSCRIPTION TV 

I admire your editorial on "subscrip- 
tion" TV (Radio- Electronics, December 
1980) and public ownership of the airways. 
However, I believe that one further logical 
step remains to be stated in your develop- 
ment of that issue. If, indeed, the airways 
belong to the public (which I most certain- 
ly believe), then those using the airways do 
so with the "consent" of the public. There- 
fore, is it not those (subscription-TV 
broadcasters) who charge for the use of 
the public airways that are guilty of theft of 
service? Are not those broadcasters the 
real pirates" rather than the decoder 



builders and the microwave receiver 
builders? Maybe "we, the people" should 
prosecute them (subscription-TV broad- 
casters) instead of they us. 
MELVINL. WILLIS. Jr. 
Mesquite, TX 

OOOOOOOO PS! 

In reference to the article entitled "The 
Incredible Shrinking IC" in the August 
1981 issue. I believe that the caption for 
Fig. 2 is incorrect. The circuit is indeed 
TTL logic, but it is an open-collector three- 
input nand gate. The schematic (Fig. 1) for 




FIG. 1 

that circuit is shown here. Note that the 
base of each transistor is brought out for 
external connection to bonding pads. 
That was common in early circuits, espe- 
cially experimental ones, as transistor 
parameters varied widely and were often 
measured to provide better quality control 
in manufacturing. 
BARRY LORNITZ 
Kingsport, TN 



CABLE TV 

Although I see the advantage of a cable- 
ready TV with its built-in converter and 
decoder (editorial, Radio- Electronics, 

June 1981 ), I do not share your hope that 
the cable companies will necessarily re- 
duce their subscription fees, just because 
they no longer have to supply such equip- 
ment themselves. Do telephone rates go 
down because one is able to buy a tele- 
phone set from other manufacturers than 
Ma Bell? 

As for the consumer having a "choice," 
the problem is not whether the converter 
comes with the TV set or from the cable 
company — or whether the cable company 
attaches some gizmo to the subscriber's 
set. The problem arises from the manner 
in which free competition for the viewers 
dollar is hindered by local governments 
which give monopoly rights to cable com- 
panies in their jurisidictions. Such cable 
companies should no more have monopo- 
lies on rights to sell electric signals than 
McDonalds have to sell hamburgers. 

In my view, the only consumers who 
now have a real choice are those who con- 
struct their own decoders and intercept 
signals from pay-TV. because they recog- 
nize that the idea of a private company 
charging a fee for picking up electromag- 
netic waves from the air, which is public 
property, is not too different from the idea 
of allowing some private profit-making 
firm to set up toll booths along inter- 
state highways. 
BUD DAMNJANOVITCH, 
Utica, Ml R-E 



Presenting the first 
component tester 
with a built-in 
oscilloscope. 

The HM 307. 




Component Test Patterns 



Why buy just an oscilloscope? For just $405, you can buy ihe Hameg 307, a high quality 
10 MHz oscilloscope, with the added bonus of being able to test electrical components. With 
the press of just one button, you can test transistors, diodes, zeners, capacitors (in circuit 
or not!!) and more. The HM 307's light weight (8 lbs.) and sturdy construction make it equally 
at home in field or on the test bench, ideally suited for T.V. repair work. Bandwidth DC 
10 MHz (-3dB) • Y amp range 5mV/crn to 20V/cm • Max. input voltage 500V (DC + peak AC) 
• Timebase .5 us/cm to ,2s/cm • Trigger sens. 3mm (2Hz to 30MHz) • Built-in square wave 
generator 1kHz for probe alignment (.2V ± 1%). The HM 307...more than just an oscilloscope. 



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EQUIPMENT REPORTS 



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Creative Electronics 
ESR Meter 



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Creative Electronics ESR Meter 



INSTRUCTION 
MANUAL 



PRICE/ 

/VALUE 




WHETHER IT IS A CAPACITOR. INDUCTOR, 
or something else, every electronic 
component causes a voltage drop across 
it when it is used in a circuit. That 
means that every component has a 
measurable resistance associated with 
it (in addition to its capacitance, in- 
ductance, etc.). The ESR Meter from 
Creative Electronics uses that resis- 
tance, called ESR (Equivalent Series 
Resistance), as the means of testing 
electrolytic capacitors, 

This is not just another capacitor 
tester: It is one of the few really new 
pieces of test equipment to be intro- 
duced in many years. Perhaps the best 
way to explain the advantages of using 
a component's ESR for troubleshooting 
is to quote a few lines from the unit's 
instruction manual: 

"...We have yet to find an electro- 
lytic capacitor with normal ESR 
whose circuit failure was due to 
capacitance change alone... The 
real problem with electrolytics isn't 
capacitance change, it's ESR 
change!" 

The ESR Meter will uncover circuit 
defects resulting from defective electro- 
lytic capacitors that might otherwise go 
undetected, and can be used without 



removing the component under test 
from the circuit {although you should 
be sure to switch the power off to elimi- 
nate any possible shock hazard), 

I had a TV set on the bench at the 
same time that I was evaluating the 
ESR Meter for this report. The symp- 
toms indicated a bad electrolytic. A 
quick check with the meter showed that 
one section of a four-section filter 
capacitor was bad. (How would you 
like to try finding that by trial and error!) 
Bridging an electrolytic into the circuit 
eliminated the problem, confirming 
what the meter had indicated. What 
could be easier? The meter had success- 
fully discovered the problem in a 
minimal period of time, and I didn't 
even have to turn the set on! 

The meter can also be used to check 
a capacitor for loose leads. Simply con- 
nect the suspect component to the 
meter and flex the capacitor's leads. A 
loose connection will be revealed by a 
change in the capacitor's ESR reading. 
The meter will also detect and reveal a 
L 'dry" electrolytic. 

The ESR Meter has a range of [ to 
1 0.000 nF. Its circuit uses two IC's and 
two transistors, and is constructed on a 
single epoxy-glass PC board mounted 
in a case measuring 6'4 x 3% x 2\6. 
inches; a schematic diagram is included 
with the instructions. The layout is not 
crowded, and that should make ser- 
vicing a snap — if it's ever required. The 
unit requires two "C" cells for opera- 
tion and the expected battery life is 
about 200 hours. 

The device is covered by a 60-day 
guarantee. It is quite easy to use, but, 
as with any other new piece of equip- 
ment, be sure to read the instructions 
carefully first so that you get the most 
out of it. 

If you're in the market for a capacitor 
tester, be sure to keep this one in mind. 
While the way it tests capacitors may 
be unconventional, it works, and works 
well. Once you discover this little de- 
vice, it is sure to become one of the 
most useful instruments on your work- 
shop or service bench. 

The ESR Meter sells for S99.00 and is 
available only from the manufacturer: 
Creative Electronics. 1417 N. Selfridge. 
Clawson. MI 48017. R-E 



Realistic Model TV-20 
High-Fidelity TV Tuner 




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■^y^X^ 



TELEVISION VIEWERS HAVE LONG HAD 

to endure the poor sound-quality that is 
typical of most home receivers. While 
most TV sound is now transmitted with 
the same frequency response as FM 
radio, reproducing that sound faithfully 
has not been a prime concern of most 
manufacturers. A new product from 
Radio Shack (1400 One Tandy Center, 
Fort Worth, TX 76102) now offers you 
an alternative. Intended as an addition 
to your home component-sound-sys- 
tem, the Realistic model TV-20 is a 
complete 12-channeI high-fidelity 
monophonic tuner. 

Its circuit consists of a bipolar VHF- 
TV turret tuner with an active mixer 
(most TV tuners use a simple diode 
mixer) followed by a 41.25-MHz IF 
stage. Two ceramic filters shape the IF 
passband, and an LAI 150 FM limiter/ 
discriminator IC detects the audio for a 
single-stage preamplifier. 

The tuning knob is located on the 
front panel . A fine-tuning ring lets you 
center the sound carrier for a TV chan- 
nel much as you would adjust for the 
sharpest picture on a standard TV. The 
4 1 .25-MHz IF provides a 500-kHz AFC 
holding-range and a signal-to-noise 
continued on page 28 



26 



LOOK! 

_ 8 NEW 
^ DIGITALS 
FROM VIZ 

They can make your job a lot easier. 
NEW ...DUAL INPUT AUTORANGING 3 X A DMM 




It does the job of two autoranging DMMs 
but costs about 30% LESS. Talk about con- 
venience. You can measure or monitor volt- 
age, current or resistance from two points 
in a circuit. Extra bright digital LED display. 
Accurate to 0.1% DCV, ±1 digit. Auto-zero, 
auto-polarity, autoranging. Just push panel 
buttons to preprogram the instrument to 



perform the function you want. Measure 
any value from 1 millivolt to 1000V DC 
[750V AC). Measure audio frequencies to 
20kHz (up to 10V), From 1 microamp to 2A 
DC or AC. High or low power ohms from 
1 ohm to 20 Mfi, You'll soon find it to be 
the most used instrument 
you own! WD-753 







NEW... 

MULTI-COUNTER 

A dual input counter with frequency range 
from 5 Hi to 125 MHz. For audio, video, 
CB and other high-frequency applications. 
Four gate times from .01 to 10 sec. Sensi- 
tivity 15 mV. Accuracy 3 ppm ± 1 count. 
WD-755 

S279.95 



NEW ... 

DIGITAL POWER LINE MONITOR 
Easy-to-read 3 digit LED display has large 
bright 0.0-in. digits. Indicates brown-out 
condition. Instantly shows line voltage 
fluctuations. Range from to 500 VAC. 
Freq. 50 Hz to 60 Hz. Current limit 8A. 
Com pact— approximately 
4x5x3 in. WD-121 SB3.35 




NEW . . . DOUBLE SLOT SUPPLYST 
POWER SUPPLY 

Outputs at 5V or 13VDC, precision ad- 
justable ±1'AV. to 7.5A, current limiting. 
Lab quality test logic or mobile equipment 
Read digitally volts and amps or use as 
to 99V DC external voltmeters on two 
large 3-d ig it LED 
displays. WP-709 S233.75 



NEW SUPPLYST™ 
40W POWER SUPPLIES 

Laboratory quality power sources, each with two built-in 
3 digit meters to measure or monitor voltage or current. 
Adjustable current limiting. Choice of four supplies: 



VIZ RELIABILITY 

VIZ is a 50 year-old company. Our instruments are 

fully warranted, parts and labor, for a year. 

All items tested to NBS standards. We offer 

service and parts availability for a minimum of 

ten years. Over 15 repair depots in U.S.A. 







SingSe output Dual output Triple output 0-20V, 750mA. 

D-40V, 0-1 A 0-20V, 0-1 A. 0-20 V, 0-1 A. 0-20V, 750mA. 5V, 4A. 

wp-712 $256.95 WP-713 $324.95 wp-714 $368.95 

Want full technical details and a demonstration? Call toll-free. 1-800-523-3696, for the VIZ distributor nearest you. 



Single output 
0-20V, 0-2A 

WP-711 $244.95 



z 
o 
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m 

CD 

m 

3D 

<o 

CD 



27 




Look to VIZ for value, quality, availability. 
Over 70 instruments in the line— PLUS full accessories. 

VIZ Mfg. Co., 335 E. Price St., Philadelphia, PA 19144 



CIRCLE 68 OH FREE INFORMATION CARD 






EQUIPMENT REPORTS 



continued from page 26 



ratio of 60 dB (using a 1 -millivolt input 
on channel 8). Primary image rejection 
on channel 8 is 58 dB: IF rejection is 45 
dB. The IF limiter's AM suppression is 
rated at 46 dB. 

Distortion from the unit is claimed to 
be less than 0.5% within 3 dB, IHF (/n- 
stitute of tfigh Fidelity) sensitivity is 
rated at 7 microvolts, with a 3-dB limit- 
ing sensitivity of 3 microvolts. Maxi- 
mum signal-handling capacity is given 
as 200 millivolts. A front-panel output 



level control varies the audio-output 
level from zero to 1.5 volts for a I -milli- 
volt input. 

Rear-apron terminals include two F- 
type TV connectors for coaxial cable; 
screw terminals are also available for 
twin-lead. Don't be mislead by the 
separate left-channel and right-channel 
output jacks — this is not a stereo unit. 
The jacks are connected in parallel and 
merely assure that the input signal to 
your amplifier is balanced. 

Housed in a wood-grain -finish plastic 
cabinet with an anodized-aluminum 
front panel, the unit measures Wi x V/% 
x 5 l A inches and weighs IVi pounds. It 
requires 1 17-volts AC for operation. 



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Rugged DMMs from Keithley — all feature large, bright 
LCD display, easy-to-use rotary switches, externally accessible 
battery and fuse, 10A current range, diode test capability, low 
battery indicator, cushioned components. 

Model 131. Similar Model 130. Our 

(o Model 130, with most popular model, 

increased the price/perfor- 



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Model 135. First 
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800-223-0474 



64 WEST *5th STREET, NEW YQRK, N ¥ 10036 2 1 2 6A7-2224 







If you are interested in high-quality 
television audio, the Realistic model 
TV-20 merits your consideration. It 
sells for $79.95, and is available at 
Radio Shack. R-E 




Chromatics 

Chroma Chime 

Electronic Door Chime 




CIRCLE 103 ON FREE INFORMATION CARD 



Chromatics Chroma Chime 




OVERALL 
PRICE 




































EASE 
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THE CHROMA CHIME ELECTRONIC DOOR 

chime does a lot more than its name 
implies, as I recently discovered when 
my old doorbell gave up the ghost and 
had to be replaced. 

It doesn't just go "ding-dong," like 
my old one (that one actually only went 
"clunk", which is one reason I re- 
placed it), but can play several bars of 
any of 24 different melodies — from the 
standard Westminster chimes to "God 
Save the Queen" ("My Country 'tis of 
Three") or Rossini's "William Tell 
Overture" — with 21 more still to choose 
from. 

The Chroma Chime also features two 
inputs; it will play one tune if there's 
someone ringing at the front door, and 
a different one if there's someone at the 
back. 

It can be operated from two nine-volt 
batteries ("standby" current drain is 
less than 0.5 mA) or, if a l2-to-16-voit 
bell transformer is already available — 
as would probably be the case if an old 
unit were being replaced — that power 
source can be used. If the Chroma 
Chime's built-in speaker isn't adequate 
for you (and I can hear it throughout 
continued on page 32 



28 



Now the stars are within your reach 



Movie Stars 
Concert Stars, 
Sports Stars 



IK 



Heart** 1 





1 M 1 
III 




II 












„ 





Ilfc' r 5«i l*^.^ v -O mSB 



Your favorite stars are coming off the satellites right now in 
one of the-greatest selections of family and adult entertainment 
ever offered. And now there's a new satellite receiver system 
that puts it all within your reach at a price that's within reach. 

The new Heathkit Earth Station 

It includes a 3-meter Satellite Antenna with a single-axis 
adjustable mount that lets you direct your antenna to receive 
signals from the entire satellite arc. It's a heavy-duty, commer- 
cial-quality antenna, made by Scientific-Atlanta and designed for 
iong. reliable performance. 

Special Low-Noise Amplifier and Down-Converter converts 
signals to 500 MHz band for transmission on ordinary TV cable. 

The Receiver features electronically-synthesized tuning for 
stable, drift-free reception, and 24 channel selections for a broad 
variety of programming. It even includes a special Zenith Space 
Command Remote Control so you can change programs without 
leaving your easy chair. 

Special Earth Foundation Kit anchors your antenna firmly to 
withstand winds of up to 100 mph. 

Unique Site Survey Kit 

You can trust Heath to do if right. The first step in establishing 
your station is the purchase of a special Site Survey Kit that 



■ I PWIUUVJ l^ ¥^i Jf Li ill ly JVU nu^u iv ul, L^ *_ i_i i-i'.ii'i ill iv ^i fnym 

to the satellites. So you know your location is correct before you 
buy the Station. 

Easy-to-follow, step-by -step assembly 

Like all Heathkit products, the Satellite Earth Station includes 
a clearly written manual that guides you every step of the way 
through assembly and installation. And over-the-phone 
assistance is always available. 



For complete details and prices on the Heathkit Earth Station 
and 400 other electronic kits for home, work or play, send today 
for the latest free Heathkit Catalog or visit your nearby Heathkit 
Electronic Center." 

rr-^3j| Send for free catalog 

■Jr* I Write to Heath Co., Dept. 020-836, 
' -v j Benton Harbor, Ml 49022 

Visit your Heathkit Store 

Heathkit products 

are displayed, sold 

and serviced at 56 

Heathkit Electronic 

Centers in the U.S. See 

your telephone white 

pages for locations. 

'Healhkit Electronic Comers are units of Ve rite en nolo fly Electronics Corporation 

Viewing of some satellite TV channels may require the customer to obtain 
permission from, or make payments to. the programming company. The customer 
is responsible lor compliance with all local, state and federal governmental laws 
and regulations, including but not limited to construction, placement and use For 
use only in Continental U.S. 



Heathkit 






EQUIPMENT REPORTS 



•ontimted from page 28 



my house), an external speaker is avail- 
able as an option. 

How it works 

The heart of the Chroma Chime is a 
Texas Instruments TMSI0O0 micropro- 
cessor. That IC not only provides the 
logic needed to play the tune that is 
selected, but also carries all 24 tunes in 
its on-board ROM. 

When a doorbell button is pressed, 
the microprocessor checks the melody- 
selector switches to see which tune is 
required. Having determined that, it then 
looks up the selected tune in its ROM 
and generates the appropriate audio 
output. 

That signal is then amplified and pro- 
cessed to remove some of its square- 
wave characteristics and make it sound 
more like a chime or other musical 
instrument. 

The user can select the tempo of the 
melody (how fast it will be played) and. 
by means of the decay control, how 
quickly the tones die away. The tempo 
circuitry also enriches the sound by 
generating a tremelo effect. 

The audio output can be made to 
sound like anything from the output of 



a signal generator to a sharply-plucked 
violin string. I've set mine to approxi- 
mate the sound of a harpsichord. 

The microprocesor automatically 
shuts off the device when the selection 
is ended, whether or not the doorbell 
button is still depressed. There is an ex- 
ception to this, though. Several pieces 
("The Star Spangled Banner," for ex- 
ample) have an "extended-play" op- 
tion — if the button is still depressed, a 
few more bars will be played. Then the 
microprocessor shuts the unit off. ex- 
tending battery life. 

Design and assembly 

Although the Chroma Chime is avail- 
able as an assembled unit. I chose to 
build the kit version. 

The assembly manual is better written 
than average, and is well illustrated. 
The PC board is screened with the out- 
lines of the components, to make things 
still easier for the builder. 

Although the IC used is manufactured 
by TI, the unit itself was designed, and 
the manual written, in England. Here 
are a few hints that may simplify mat- 
ters for those unfamiliar with life 
abroad: 

First, English technology sometimes 
differs from our own. For example: a 
"skeleton pot" is a trimmer pot. Those 
pots are referred to as "RV1, RV2," 
etc. "RV" probably stands for "resis- 



tor, variable." 

Also, transistor pinout is frequently 
"CBE" or "ECB," while ours is 
usually "EBC." It's possible that any 
of several transistors may have been in- 
cluded in your kit (all the types are 
illustrated) and it's necessary to check 
the part numbers against the pinouts 
shown in the manual to make sure that 
you're installing the components cor- 
rectly. 

(My kits contained several transis- 
tors whose numbers were identical, ex- 
cept for the last letter. Naturally, I 
ignored that letter and installed every- 
thing backwards. Fortunately, no harm 
was done. The transistors were re- 
moved and reversed, and the unit func- 
tioned as promised.) 

The switches used to select the tunes 
are a bit unusual. The switch contacts 
are part of the PC-board foil pattern, 
and are contacted by spring-loaded 
wipers. Although unorthodox, the sys- 
tem works well. 

The case is white plastic with con- 
cealed, but easily accessible, adjust- 
ment and battery compartments, and 
will blend in with most decorating 
schemes. Installation instructions are 
detailed and easy to follow. 

The Chroma Chime is a clever appli- 
cation of LSI technology and. whether 
you buy it "ready to go," or as a kit, is 
continued on page 36 



MRO solid state problems? 



epafl 



1,400 RCA SK Series 
+3,500 JEDEC* Devices 



4,900 MRO Solutions 

To fill your solid state replacement needs — for MRO/ indus- 
trial and consumer applications — see your RCA Distributor 
for copies of the 1981 RCA MRO Replacement Manual (1 K6804) 
and the 1981 RCA SK Replacement Guide (SPG-202Z), 

For a list of RCA Distributors, write to Sates Promotion 
Services. RCA Distributor and Special Products Division. 2000 
Clements Bridge Road, Deptford. N.J. 08096. 



en 
u 

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cr 

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O 



UJ 

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32 



For MRO/ 
Industrial applications 
Make replacements from your 
RCA Distributor's shelf with 3.500 RCA 
JEDEC and RCA commercial types. 



For MRO.industrial and 
consumer applications 
1,400 SK replacements for more than 
170,000 domestic and foreign ty. 



>enes 



■Joint Electron Device Engrneei ing Council 



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ItC/l 



lid State 



CIRCLE 33 ON FREE INFORMATION CARD 



BBC 

BROWN BOVOH 



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subject to change without notice 



or write for additional information on our UNE OF RECORDERS 



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METRAWATT 



U.S-A. 

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Raritan Center 

165 Reldcrest Avenue 

Edison, N.J, 08837 

Phone: (201) 225-4414 • Telex: 84 44 31 

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•Designed by Porscf 



CANADA 

RADIONICS LIMITED 

Scarborough, Ontario (416) 292-1575 

Montreal, Quebec (514) 335-0105 

Ottawa, Ontario (613) 521-825! 

Vancouver, B.C. (604) 732- 7661 



outer. 




Introducing 
the Sinclair ZX81 

If you're ever going to buy 
a personal computer, now is the 
time to do it 

The new Sinclair 2X81 is the 
most powerful, yet easy-to-use 
computer ever offered for anywhere 
near the price; only $149,95* completely 
assembled. 

Don't let the price fool you. The 
ZX81 has just about everything you 
could ask for in a personal computer. 
A breakthrough 
in personal computers 

The ZX81 is a major advance over 
the original Sinclair 7X80— the world's 
largest selling personal computer and 
the first for under $200. 

In fact the 2X81 s new 8K Extended 
BASIC offers features found only on com- 
puters costing two or three times as much. 

Just look at what you get: 

■ Continuous display, including moving 
graphics 

■ Multi-dimensional string and numerical 
arrays 

' Plus shipping and handling. Price Includes connectors 
for TV ana cassette, AC adaptor, and FREE manual. 



■ Mathematical and scientific functions 
accurate to 8 decimal places 

■ Unique one-touch entry of key words 
like PRINT. RUN and LIST 

■ Automatic syntax error detection and 
easy editing 

■ Randomize function useful for both 
games and serious applications 

■ Built-in interface for ZX Printer 

■ 1K of memory expandable to 16K 

Trie ZX81 is also very convenient 
to use. It hooks up to any television set 
to produce a clear 32-column by 24-line 
display. And you can use a regular 
cassette recorder to store and recall 
programs by name. 



If you already own a ZX80 
The 8K Extended BASIC 
chip used in the ZX81 is available 
as a plug-in replacement for your 
ZX80 for only $39.95, plus shipping 
and handling— complete with new key- 
board overlay and theZX8l manual. 
So In just a few minutes, with no 
special skills or tools required, you can 
upgrade your ZX80 to have all the 
powerful features of the 2X81. (You'll 
have everything except continuous dis- 
play, but you can still use the PAUSE 
and SCROLL commands to get moving 
graphics.) 

With the 8K BASIC chip, your 
ZX80 will also be equipped to use the 
2X Printer and Sinclair software. 

Warranty and Service Program** 

The Sinclair ZX81 is covered by a 
10-day money-back guarantee and a 
limited 90-day warranty that includes free 
parts and labor through our national 
service-by-mail facilities, 

'■Does not apply loZXBl kits. 




NEW SOFTWARE:Sinc!aif has 
published pre-recorded pro- 
grams on cassettes for your 
ZX81, or ZX80 with 8K BASIC. 
We're constantly coming out 
with new programs, so we'll 
send you our latest software 
catalog with your computer. 



ZX PRINTER: The Sinclair ZX 
Printer will work with your ZX81, 
or ZXBO with 8K BASIC. It will 
be available in the near future 
and will cost less than $100. 



16K MEMORY MODULE: 

Like any powerful, full fledged 
computer, the ZX81 is expand- 
able. Sinclair's 16K memory 
module plugs right onto the 
back ot your ZX81 (or ZX80, 
with or without 8K BASIC). 
Cost is $99.95, plus shipping 
and handling. 



ZX81 MANUAL: The ZX81 
comes with a comprehensive 
164 -page programming guide 
and operating manual de- 
signed for both beginners and 
experienced computer users 
A $10.95 value, it's yours free 
with the ZX81. 




Introducing 
the ZX81 kit 

If you really want to 
save money, and you enjoy 
building electronic kits, you 
can order the ZX81 In kit form 
for the incredible price of just 
$99.95* It's the same, full-featured 
computer, only you put it together 
yourself. We'll send complete, easy- 
to-follow Instructions on how you can 
assemble your ZX81 in just a few hours. 
All you have to supply is the soldering iron 

How to order 

Sinclair Research is the world's larg- 
est manufacturer of personal computers. 

The ZX81 represents the latest 
technology in microelectronics, and it 
picks up right where the ZX80 left oft. 
Thousands are selling every week. 

We urge you to place your order 
for the new ZX81 today. The sooner you 
order, the sooner you can start enjoying 
your own computer. 

To order, simply call our toll free 
number, and use your MasterCard or VISA 
f\ To order by mail, please use the 

**^ \pupon. And send your check or money 
\ order. We regret that we cannot accept 
\ purchase orders or C.O.DIs. 

CALL 800-543-3000. Ask for op- 
erator #509. In Ohio call 800-582-1364. 
in Canada call 513-729-4300. Ask for 
operator #509, Phones open 24 hours 
a day, 7 days a week. Have your Master- 
Card or VISA ready. 

These numbers are for orders 
only. For information, you must write to 
Sinclair Research Ltd., One Sinclair Plaza 
Nashua, NH 03061. 



iinczlaii - 



fCITY/STATE/ZIP. 

t US. Dollars 



EQUIPMENT REPORTS 



continued from page 32 



a worthwhile investment for the home- 
owner. 

The Chroma Chime kit sells for $39.95, 
postpaid, from Chromatics, River Way, 
Harlow, Essex, England. An assembled 
version can be ordered for $49.95 from 
Timely Products Corp., 222 W, Adams 
St., Chicago, IL 60606. R-E 



Ungar Model 4000 

Hot Vac Desofdering 

System 




CIRCLE 104 ON FREE INFORMATION CARD 



Ungar Hot Vac 




OVERALL 
PRICE 






















EASE 




















OF USE 












■ ■ 


INSTRUCTION 
MANUAL 




























| 












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1 


2 


3 


4 


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6 


7 


8 


9 


10 


^ 


^y^y^f 



Q 
< 

36 



A TOOL-HAPPY TECHNICIAN LIKE MYSELF 

always enjoys finding something that 
really does the job. The model 4000 Hot 
Vac desoldering system from Ungar 
(Division of Eldon Industries, Inc., PO 
Box 6005, Compton, CA 90220) is just 
such a device. In operation, the solder 
is first melted, and then sucked into a 
reservoir by a built-in vacuum pump. 
The whole operation is very fast, and 
speeds up bench work considerably. 

The system consists of two units: a 
small cabinet that houses the vacuum 
pump and motor, and the desoldering 
gun. The gun is connected to the cabinet 
by the vacuum line and the control 
wiring. The gun's heating element is set 
to the desired temperature by a control 
knob on the front of the cabinet. 

The gun's screw-on tip is hollow. To 
desolder, simply place the tip of the gun 
over the solder you wish to remove, 
and when the solder has melted, push 
the button on the left side of the handle. 
That button starts the vacuum pump, 
and the solder is removed very quickly. 



In a second or two, you're left with a 
clean lead and pad. 

The melted solder goes through the 
tip of the iron into a reservoir at the top 
of the gun. The reservoir has a clear 
"window" on each side of the gun so 
that you can tell when it needs emptying. 
The maintenance required for the unit 
is minimal. A cotton ball is used to 
catch most of the solder in the reservoir. 
When it becomes clogged, all you do is 
unscrew a cap on the rear of the gun 
and remove and replace the ball — the 
unit comes with an ample supply of 
them. The gun tip should be cleaned 
after every 50-60 desoldering opera- 
tions (that should cover a couple of 
days' average work) using a rod (more 
on that later) supplied with the unit. 
Cleaning, which serves to remove any 
solder not caught by the cotton ball, 
should be done with the tip hot. A 
secondary filter, near the cabinet in the 
vacuum iine, should be cleaned with 
alcohol once a week. 

Five different-sized tips are included 
with the unit. The tips can be changed 
even when hot — but I recommend using 
a pair of pliers, not your fingers! Every- 
thing you need to use the desoldering 
system comes with it: extra cotton 
balls, a spare fuse (3 amps), a cleaning 
sponge, and a kit of the cleaning rods. 
The cleaning rods (one for each tip size) 
and a small file are stored in a metal 
case that is attached to the cabinet by a 
chain, so that the rods are always there 
when you need them. 

Using the Hoi Vac is simple. The 
same knob is used to turn it on and to 
set the operating temperature. A red 
pilot light on the cabinet's front is lit 
when the unit is on. When you first 
turn the unit on, set the operating tem- 
perature to maximum and let the iron 
heat up for about 10 minutes; then 
select the temperature range you re- 
quire. When the gun is not in use. it is 
slipped in the ceramic -lined holder on 
the side of the cabinet. 

The only thing that is the least bit 
tricky about using the desoldering sys- 
tem is tht you have to be careful not to 
hold the vacuum control-button down 
too long. If you do that, the air stream 
cools off the tip, and you have to wait 
until it heats up again before going on. 
One quick push is all you need; try it 
for yourself and you'll see. 

Of course, the only way to see if 
something really works is to try it out. I 
set up the Hoi Vac on a bench and lo- 
cated a discarded PC board from a 
junked TV-set. I was able to remove 
about 80 components in 45 minutes. 
They included everything from transis- 
tors and capacitors up to a couple of 
controls and a heavy-lugged trans- 
former. I did have some trouble with 
the transformer; its lugs were !4-inch 
continued on pane 95 



Visit Your Heathkit 


Electronic Center* 


where Heath 1 Zenith Products are 


displayed, sold and serviced. 


PHOENIX, AZ 


6RIDGET0N, M0 


2727 W. Indian School Ftd. 


3794 McKeivey Rd. 


602-279-6247 


314-291-1650 


ANAHEIM, CA 


OMAHA. NE 


330 E. Ball Rd, 


9207 Maple St. 


714-776-9420 


402-391-2071 


CAMPBELL. CA 


ASBURYPARK. NJ 


2350 S BascomAve. 
408-377-8920 


1013SlateHwy.35 
201-775-1231 


ELCERRIT0.CA 

6000 Potrero Ave. 

415-236-8870 


FAIR LAWN, NJ 
35-07 Broadway (Rt. 4) 
201-791-6935 


LA MESA, CA 
8363 Center Dr. 

714-461-0110 
LOS ANGELES, CA 


AMHERST, NY 

3476 Sheridan Dr. 
715-835-3090 


2309S. Flower St. 


JERICHO, L.J. NY 


213-749-0261 


15 Jericho Turnpike 


POMONA, CA 


516-334-8181 


1555 N. Orange Grove Ave. 


ROCHESTER, NY 


714-623-3543 


937 Jefferson Rd. 


REDWOOD CITY, CA 


716-424-2560 


2001 Middlelield Rd. 


N.WHITE PLAINS. NY 


415-365-8155 


7 Reservoir Rd. 


SACRAMENTO, CA 


914-761-7690 


1360 Fulton Ave. 


CLEVELAND, OH 


916-466-1575 


28100 Chagrin Blvd. 


WOODLAND HILLS, CA 


216-292-7553 


22504 Ventura Blvd 


COLUMBUS, OH 


213-883-0531 


2500 Morse Rd. 


DENVER, CD 


614-475-7200 


5940 W. 38th Ave. 
303-422-3408 


TOLEDO, OH 

48 S, Byrne Rd. 


AVON , CT 


419-537-1887 


395 W, Mafn-St. (fit. 44) 
203-678-0323 


W00DLAWN.0H 


HIALEAH, FL 

4705W.16thAve. 


10133 Springfield Pike 
513-771-8850 


305-823-2280 


DKLAHOMACITY.DK 


PLANTATION, FL 

7173 W. Broward Blvd. 
305-791-7300 


2727 Northwest 
Expressway 

405-848-7593 


TAMPA, FL 


PORTLAND. OR 


4019 W.Hillsborough Ave 


- see Vancouver, WA 


813-886-2541 


FRAZER, PA 


ATLANTA, DA 


630 Lancaster Pike 


5285 Roswell Rd 


(Rt. 30) 


404-252-4341 


215-647-5555 


CHICAGO, IL 


PHILADELPHIA, PA 


3462-66 W. Devon Ave 


6318 Roosevelt Bivd 


312-583-3920 


215-288-0180 


DDWNERSGHOVE.IL 


PITTSBURGH, PA 


224 0gdenAve. 
312-552-1304 


3482Wm.PennHwy. 


412-824-3564 


INDIANAPOLIS, IN 


WAHWICK, Rl 


2112E,62ndSt. 


558 Greenwich Ave. 


317-257-4321 


401-738-5150 


MISSION, KS 


DALLAS. TX 


5960 Lamar Ave. 


2715 Ross Ave 


913-362-4486 


214-826-4053 


LOUISVILLE, KY 

12401 Shelbyville Rd. 
502-245-7811 


FORT WORTH, TX 
6825-A Green Oaks Rd. 
817-737-8822 


KENNER.LA 
1900 Veterans 
Memorial Hwy. 
504-467-6321 


HOUSTON, TX 

1704 W. Loop N. 
713-869-5263 


BALTIMORE, MD 

1713E.JoppaRd. 
301-661-4446 


SAN ANTONIO, TX 

7111 Blanco Road 
512-341-8876 


ROCKVILLE, MD 


MIDVALE, UT 


5542 Nicholson Lane 
301-881-5420 


58 East 7200 South 
801-566-4626 


PEA BODY. MA 


ALEXANDHtA.VA 


242AndoverSt. 


6201 Richmond Hwy. 


617-531-9330 


703-765-5515 


WELLESLEY, MA 


VIRGINIA BEACH, VA 


165 Worcester Ave. 


1055 Independence Blvd. 


617-237-1510 


804-460-0997 


DETROIT, Ml 


SEATTLE, WA 


18645 W. Eight Mile Rd 
313-535-6480 


505 8th Ave. N. 


206-682-2172 


E. DETROIT, Ml 


TUKWILA.WA 


18149 E Eight Mile Rd. 


15439 53rd Ave. E. 


313-772-0416 


206-246-5358 


HOPKINS, MN 


VANCOUVER, WA 


101 Shady Oak Rd. 


516S.E.Chkalov Drive 


612-938-6371 


206-254-4441 


ST. PAUL, MN 


MILWAUKEE, Wl 


1645 White Bear Ave, 


5215 W. Fond du Lac 


1 612-778-1211 


414-873-8250 


1 "Units of Verilecti no logy Electronics Corp. CP-1!J9Fi2 



WHAT'S THE KEY 
TO BUYIHG A COMPUTER? 



Look beyond the computer. Look at how the total 
system- hardware, software, support, service- 
meets your needs, today and tomorrow. That's the 
key. When you choose a computer source, you 
choose a long term partner who must stand by you 
with total support. And no one stands by you like 
Heath/Zenith. 

Software 

Including word processing, business applications, 
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And a choice of three operating systems, including 
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thousands of popular CP/M programs. 

Languages 

For your own custom programs, Microsoft languages 
are available in BASIC {compiler and interpreter), 
FORTRAN and COBOL. 

Self-Study Courses 

Learn at your own pace with Programming Courses 
that teach you to write and 
run your own programs 
in Assembly, BASIC, 
Pascal or COBOL 




For the business person, Computer Concepts for 
Small Business helps you evaluate the ways a com- 
puter can benefit your business. And for the novice, 
Personal Computing is a complete introduction to 
computer fundamentals and BASIC Programming. 

Support 

Before and after the sale we work with you to con- 
figure the system that serves you best. We help you 
get your system up and running smoothly. Assist- 
ance is always just a phone call away. 

Service 

Friendly, experienced technicians are available, 
either over the phone or at any of the 56 Heathkit 
Electronic Centers nationwide. 

Visit your Heathkit Electronic Center* 

Pick the store nearest you from the list at left. And 
stop in today for a demonstration of how Heath/ 
Zenith Computer Systems can serve you. If you can't 
get to a store, send $1.00 for the latest Heathkit 
Catalog and the new Zenith Data Systems Catalog 
of assembled commercial computers. Write to 
Heath Co., Dept. 020-834, Benton Harbor, 
Ml 49022. 

Pick a strong partner. 
Heath/Zenith & You. 



HEATH/ZENITH 



Your strong partner 



Units of Veritechnology Electronics 
Corporation m the U.S. 

Specifications subject lo change wllhout notice, 



CP-2G3A 



If you have put off 
learning more 
electronics for any 
of these reasons, 
act now! 



□ I don't have the time. 

3 High school was hard for me and 
electronics sounds like it may be 
hard to learn. 

□ I can't afford any more education. 

□ I have a family now. 

□ I'm here. You're there. I've never 
s learned that way before. I'm not 



o 
a 

a 

d 

1 

O 

Q 



sure it will work for me. 



s Read the opposite page and see how you can get started today! 



38 



Be honest with yourself. Are 
the reasons really excuses? You 
already know enough about 
electronics to be interested in 
reading this magazine. So why 
not leam more? If you need 
encouragement, read on and 
see how excuses can be turned 
Into results. 

You don't have the time. Be realistic. 
Ail you have in life is a period of time. 
Use it. Try to know more tomorrow 
than you do today. That's the proven 
way to success. C1E studies require just 
about 12 hours of your time a week, two 
hours a day. You probably do have the 
time. 

Electronics sounds like it may be hard 
to learn. You already know something 
about electronics or you wouldn't be 
reading this. Now, build on that. CIE 
Auto-Programmed ® Lessons help you 
learn. Topics are presented in simple, 
logical sequence. All text is clear and 
concise for quick, easy understanding. 
You learn step by step, at your own 
pace. No classes to attend. Nobody 
pressures you. You can learn, 
You can't afford any more education. 
Actually, you can't afford NOT to 
gain the skills that can put you ahead of 
the others. You know what inflation is 
doing to you now. Education — learning 
a skill— is an inflation-fighter that can 
be yours. If you are not able to pay full 
tuition now, CIE will lend you funds on 
a monthly payment plan. 
You have a family now. All the more 
reason why yon have the responsibility 
to advance yourself. For the sake of 
your family. Do you want them to have 
what you had or have more than you 
had? The choice is yours. Electronics is 
a rewarding career choice. CIE can help 
you to get started on that career. 
You're there. We're here. How does 
CIE help you learn? First, we want you 
to succeed.' You may study at home, but 
you are not alone. When you have a 
question about a lesson, a postage 
stamp gets you your answer fast. You 
may find this even better than having a 
classroom teacher. CIE understands 
people need to learn at then own pace. 
When CIE receives your completed 
lesson before noon any day of the week, 
it will be graded and mailed back the 
same day with appropriate instructional 
help. Your satisfaction with your 
progress comes by return mail. That's 
how CIE helps you learn. 

NOW, IF YOU AGREE CIE 
TRAINING CAN WORK 
FOR YOU, HOW ELSE 
CAN CIE HELP YOU? 

Cleveland Institute of Electronics is the 
largest independent home study school 
in the world that specializes exclusively 
in electronics. Although "big" does not 
always mean "best" it is evidence that 
CIE is a strong, successful institution 
with the people and resources to help 
you succeed. 




Step-by-step learning includes 
"hands-on training. 

The kind of professional you want to be 
needs more than theory. That's why 
some of our courses include the 
Personal Training Laboratory, which 
helps you put lesson theory into actual 
practice. Other courses train you to use 
tools of the trade such as a 5MHz 
triggered -sweep, solid-state oscilloscope 
you build yourself — and use to practice 
troubleshooting. Or a Digital Learning 
Laboratory to let you apply the digital 
theory that's essential today for anyone 
who wants to keep pace with electronics 
in the eighties. 




Your FCC License can impress 
employers. 

For some electronics jobs, you must 
have your FCC License. For others, 
employers usually consider it a mark in 
your favor. Either way, your License is 
government-certified proof of your 
knowledge and skills. More than half 
of CIE's courses prepare you to pass 
this exam. Surveys show that some 
80% of CIE graduates who take the 
exam are successful. 



Find out morel 
Today. Now. 

There's a card with this ad. Fill it in 
and return. If some other ambitious 
person has already removed it, use the 
coupon. 

You'll get a copy of CIE's free 
school catalog, along with a complete 
package of personal home study 
information. 

For your convenience, we'll try to 
arrange for a CIE representative to 
contact you to answer any questions 
you may have. 

If you are serious about a rewarding 
career, about learning electronics or 
building on your present skills, your 
best bet is to go with the electronics 
specialists — CIE. Mail the card or 
coupon today or write CIE (please 
mention the name and date of this 
magazine), 1776 East 17th Street, 
Cleveland, Ohio 44114. 

This could be the best decision 
you've made all year. 

Associate Degree 

Now, CIE offers an Associate in 
Applied Science Degree in Electronics 
Engineering Technology. In fact, all 
or most of every CIE Career Course 
is directly creditable towards the 
Associate Degree. 

"If you're going to learn 
electronics, you might as well 
learn it rights 

John Cunningham 
Senior Technical Director 



CIE 



Cleveland Institute 
of Electronics, Inc. 




T7~76 East 17th Street. Cleveland. Ohio AAltA 
Accredited Member Nelfonat Home Study Council 



D YES...1 want to learn from the specialists in electronics — CIE. Send me my FREE 
CIE school catalog... including details about the Associate Degree program... plus my 
FREE package of home study information. 

Print Name 



Address. 

City 

State 

Age 



Apt. 



_Zip_ 



.Phone (area code)_ 



Check box for G.L Bill bulletin on Educational Benefits: D Veteran D Active Duty 

MAIL TODAY! RE 24 



z 
o 
< 
m 

CD 

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41 



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With 10 Amp AC/DC Range 







• Unprecedented Five- Year Warranty! 

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Far mare information on fheAWS 
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Which of I 
the word 
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belnu 
make a 
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out of 
the amply 
D.rid? 



INFORMATION 

EXPLOSION 

FOR TV 




PCTRESS HARNESS IWRESS THEATRE TREOSOmI 
NIPPLE ERSES EMTER HONGS THERE TRASH 
[T RUST 



RICHARD LARRATT 



Press 1 This eor's spec I fleet ions 

2 Your Cortex report 

3 To leave Carfax 



You'll soon be able to receive a lot more on your 

TV set than news, movies, and soap operas. Videotex will bring 

you information that you want and need, and make a 

considerable impact on your life-style. 



Today's recipe follows 
in a moment 




\< \si YOU HADN'l III \kl». VVI V! IJKKN CAUCiH'l I I' IN \\ l\l iiKvi \ I |o\ 

revolution. We've already become accustomed to receiving news from a roil n J 

the world — and even from beyond ii — instantaneously on our television sets via 

_^__^ satellite. Fifteen years ago that w;is almost ;i miracle. 

ie follows In many parts of the eouniry we are becoming a wired 

society— with news, movies, sporting events, etc. available 
to us on any number of television channels. 24 hours a day. 
Only a few could conceive of such a thing just ten y 

Those of us with home computers can now avail our- 
selves of all sorts of information utilities — news, data bases. 
I whole libraries of information. Farmers can get the latest on 
soybean futures; investors, the current state o\' the stock 
I market. Five years ago. that w;is just the beginning of a 

dream. 
Today, as you read this, there is more information, on 
more subjects, available more rapidly and readily through 
electronic communications to anyone with considerably less !. ; 
than a thousand dollars to spend on personal computing 
equipment than was available to the President of the United mag / / / / / / 
States not too long ago. 

In the next few years all thai information— and more 
will be accessible, in one form or another, to anyone who qj™ ruhs , HtTS Ef 
cares to *.lo more with his TV set than just watch movies. 
The name of the game is: videotex. 

"Videotex" is a term applied to any system thai uses 
several of the "unused" lines of a video Held taetiuilly the 
vertical blanking-interval — the dark 
i band you see when your TV picture Maris to toll) to send 
information that can be decoded to appear as lexi or il- 
• coiu»t>i« ha* und.s luslnitious on u TV screen. It von were to u.iivh ii .i line 

I* Hi r Fore* bat*- in . .. . . , , . . . 

used lot videotex would appeal to sparkle as the data w;is 
Rogan Dru Lak» «« transmitted on it. 

Its aarlv* at ]2.£5p* 

Perhaps the closest thing to videotex wuh which we are 
n'^rjiJiorMd familiar is the closed-captioning service foi the ileal cur 

,.«M5 h«i „•«*•<■«! ■' rcntly provided by the ABC. NI5C. and PBS television net- 
* J works. Closed captioning provides deaf viewers with sub 
titles for selected programs. The information is transmitted 



CUBS /////'///// 
fETS ////////// 



nEUl.1 



* send 



"he space shuttle Columbia h» leaded 
:*4elg at Edward* Air Force base in 
alHornia. 

euchoown on the Rogers Dry Lake ua* 

Kjt three minutes early, at 12 Z5pn 
hit-ago t it»e . 

11 tha critic*! Duwuvtn »***ntial 

or a vafe return wer» pvrlorntd 
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*-. VBt.matvd 100,000 had q» I he red at 
|ir.» nt« ttj vt*u tit* hlitorte *anOJin<Q 



P13C" 13 04^57 04. 1^ 81 P150 

WEATHER mwQ 



U.S OTHER MAP.. 
CHICAGO FORECAST 

ROAD NEWS 

AIR NEUS 



KEYFAX . 



122 



THHUEl 




FIG. 1— BY REQUESTING THE APPROPRIATE page number, you can tw- 
ee I vc detailed weather and travel Information— Including weather maps. 



FIG. 3— ANTIOPE, THE FRENCH videotex system. uMt a parallel-attribute 
ayatem that permlta higher-quality graphics. 



on one of the unused lines in the TV 
picture and, through a decoding de- 
vice, is superimposed over the image 
being viewed. 

Videotex uses several lines from the 
vertical blanking-interval to carry 
both video and textual information in 
digitized form for decoding and use by 
viewers equipped with devices designed 
to extract that information and dis- 
play it on the screen. How it is done 
will be described in detail in the second 
part of this article. 

What makes videotex different from 
closed captioning is the fact that the 
data is transmitted at a much more 
rapid rate— typically 5.727272 MHz 
— and is not tied into the "real-time" 
image normally seen. Not just one or 
two lines of text are available, but 
whole pages — up to several hundred 
of them — can be selected by a viewer 
with a videotex decoder. And that 
includes not only text, but pictures, as 
well; detailed weather information 
(Fig. I) is as easy to receive as the 
words "RAIN TOMORROW." 



Through videotex, the viewer can 
have over-the-air access to local or 
international news; information of 
special interest to him, such as weather 
or financial reports; or even local 
shopping information. The Sears cata- 
log, currently being distributed in test 
areas on videodisc, could be available 
nationwide by means of videotex. 

And that last item leads us into the 
other application of videotex, for, if the 
system is interactive, the user can not 
only look at the items in the catalog, 
but also purchase them. 

As we described videotex originally, 
any one of a number of "pages" could 
be selected for viewing, for the in- 
formation of the user. While, in many 
instances, that type of service would 
be all that was required, it would 
frequently be convenient for the user 
to be able to respond to the information 
he received. 

For example, let's say that you 
wanted to know who had flights from 
your airport to New York (or from 
New York to somewhere else) on a 



given date, and what the rates were. 
With videotex that would be easy. 

Suppose that you found a flight that 
was convenient for you and wanted to 
make a reservation. With interactive 
videotex, you could request a reserva- 
tion on that flight, pay for it with a 
credit card, and receive a confirma- 
tion. ..all in a minute or so! 

Similarly, you could look through a 
catalog, or the video flyer from a local 
market, and make your purchases — for 
delivery, or to be picked up later when it 
was more convenient for you. 

Interactive videotex 

Obviously, you can't talk back to 
your TV set — otherwise you'd have 
done it long ago! Even with a simple 
videotex decoder, the best you can do 
is select the page(s) of information you 
want. What's needed is something 
more. 

Fortunately, digital-computer com- 
munications created the need for a de- 
vice known as the modem (for MOdula- 
tor/Z>£Modulator). That device allows 



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LU 

6 
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d Book 
THE II 
Turkevr 



rri 



t'.uwu i t 



footer 



Sudan 



1 Europ*. Mid-*ast & H ATr 



FIG. 2 — THE BLACK LINES between different-colored areas 
acterlstlc of the serial-attribute system used by Prestal. 



char- 



FIG. 4 — TELIOON ALLOWS shapes and special character-sets to be de- 
nned and men recalled by a single command. 



you to transmit digital information over 
telephone lines as audio tones. So, by 
adding a keyboard and modem to your 
videotex setup, you can talk back to a 
computer connected to a videotex 
system. 

For example, if you find a flight to 
New York that meets your require- 
ments, you can dial a telephone num- 
ber connecting you with your nearest 
videotex center and request a reserva- 
tion on that flight. ..and receive im- 
mediate confirmation. And, if that 
flight is booked-up, you can make the 
next-best choice. All on the spot. 

Perhaps that sounds a bit familiar to 
you — like the two-way Qtibe system 
currently in use over cable-TV in the 
Columbus. OH area. Qtibe does allow 
viewer response, but only to a limited 
degree — both as regards the degree of 
response and the subjects to which you 
can respond. Also, it is available only 
over cable. Qtibe is pre-programmed 
to look for simple "yes" or "no." or 
numerical, responses. Videotex can 
offer a lot more. 



Equipment needed 

To receive non-interactive videotex 
the only thing that needs to be added to 
your existing TV receiver is a decoder. 
The decoder can be considered to have 
five main sections: a data-acquisition 
unit, RAM (Random Access Memory), 
ROM </?ead Only Memory), a video 
generator, and a means for the user to 
control the decoder. A representative 
videotex system is shown in Fig, 5. 

The data-acquisition unit performs 
two functions. First, it "tunes in" on 
the vertical-blanking lines carrying the 
videotex information— acting like a 
very selective TV receiver, as it were. 
Second, it takes that information and 
translates it from the analog format 
used to send it over the air (or cable) 
into a digital format (a series of logic- 
l'a and O's) that can be used by the 
decoder's digital circuitry. 

In the process it also converts the 
Incoming data from serial to parallel 
format. (That is necessary because, 
while the data is originally in parallel 
format — with all the bits making up a 
single character or picture element 
{pixel or pel) arranged side-by-side in 
one block — the bits have to be sent 
serially, one after the other, if they are 
to be transmitted on a video line.) 

The RAM is used to store the data, 
since it is received at a rate different 
from that at which it will be displayed 
on the TV screen. 

The ROM is pre-programmed with 
the information necessary to translate 
the digital information containing the 
characteristics of a character or pixel 
into a video image. In more sophisti- 
cated units, it may also contain a pro- 
gram for overall control of the entire 
decoder. In that context, a micro- 






processor would be involvec 

The video generator takes the data 
output by the character/pixel-generator 
ROM and turns it into a composite- 
video signal, similar to that from a TV 
camera. The signal can either be fed 
directly to a video monitor, or can be 
superimposed on a carrier generated 
by a RF-modulator and fed to the 
antenna terminals of a TV receiver. 

Finally, the controller, usually in the 
form of a numeric keypad in receive- 
only installations, allows the user to 
select which page of videotex informa- 
tion he wishes to see. 

While it sounds complex, an installa- 
tion of that sort would fit easily into a 
case the size of a cable-TV translator. 

A two-way installation would not 
require much more. The added element 
would be a communications interface 
— and possibly a typewriter-style key- 
board — that would allow the user to 



lost cable-TV systems whose ap- 
plications are under consideration 
today will provide two-way. com- 
munications, when they are put into 
service. A dedicated cable channel 
(or over-the-air channel) can transmit 
enormously more videotex information 
than can a few lines of the vertical 
blanking-interval. 

The cable-system operators are 
aware of what the future holds, and the 
communities whose franchises they 
are competing for also know that they 
will want more than just piped-in enter- 
tainment. They will want to have the 
ability to use their cable systems to get 
information out of their homes as well 
as into them. 

What's available today 

To date, videotex systems are still in 
the testing stage, with much of the test- 
ing having been done outside the United 













CHARACTER 
GENERATOR 
(ROM/RAM) 






VIDEOTEX DATA 
FROM TV 
RECEIVER 


FRAME 

MEMORY 

(RAMI 






















1 1 






1 








' 




r "i 

1 MODEM (FOR i 
. INTERACTIVE [■-* 
VIDEOTEX) 


DATA 

ACQUISITION 

UNIT 




CONTROLLER 

(ROM] 




VIDEO 
GENERATOR 


TO VIDEO 
DISPLAY 








1 
♦ 

TO 

TELEPHONE 

LINE 






1 1 










KEYPAD 







FIG. 5 — THE MODEM shown at left Is required for Interactive videotex using telephone lines lines. 
Tow-way cable service would use an Interface between the user's keypad or keyboard and the 
cable line. 



become more than a viewer and talk 
back to the system in more than simply 
"Show me page such-and-such" terms. 

With an over-the-air videotex sys- 
tem, that communication would have 
to be via telephone. Such an arrange- 
ment would require a modem, the de- 
vice that allows digital information (as 
opposed to speech) to be transmitted 
over telephone lines. The modem 
would allow the videotex user to inter- 
act with the information he had re- 
quested from over-the-air transmis- 
sions through his decoder. 

By dialing a phone number and 
giving his access code to a computer, 
he could say, in effect, "/ see that 
flight 901 is open to San Francisco. 
Please book me one first class seat on 
that flight." The airline-booking com- 
puter would accept his request, make 
the reservation (if it were still avail- 
able), and charge the flight to his 
credit card, If the flight were booked 
up, the computer might suggest several 
alternates. 



States. A number of tests have taken 
place, or are now under way in this 
country, as well. Among the TV sta- 
tions involved are WFLD in Chicago, 
WETA in Washington. DC, and KCET 
in Los Angeles. 

There are three major systems com- 
peting for acceptance, with several 
others in use in various pans of the 
world such as Germany and Japan. All 
offer one-way or interactive service, 
but differ in the way information is 
transmitted, decoded, and displayed 
on the video screen. 

The British Prestel (PRESt TELe- 
phone) uses what's called a serial 
attribute system (no relation to the 
serial-transmission format referred to 
earlier). It can transmit both text and 
images. The images, however, are q 
rather low in resolution (see Fig. 2), < 
being made up of rather large pixels. A 2 
version of Prestel, called Picture Pres- ^ 
tel allows full-color still video-frames ^ 
to be transmitted. (Other systems also <g 
'have this capability. The drawback, as - 



we'll see later, is the length of time it 
takes to transmit the picture.) 

Antiope, from France, uses a paral- 
lel-attribute system. It permits some- 
what more detailed images, without 
some of the limitations inherent in the 
Prestel system. An example of Antiope 
is shown in Fig. 3. 

The third system, Telidon (from a 
combination of Latin and Greek for 
"distant image"), was developed in 
Canada, and is more flexible than 
either of the others. It also uses a 
parallel-attribute system but, instead of 
relying on shapes stored in the de- 
coder's ROM, can download (trans- 
mit from the system's master memory 
to the memory of the user's decoder) 
specific shapes that can be used for 
the application at hand and called 
up by a single command. An example 
of Telidon's capabilities is shown in 
Fig. 4. 

Detailed descriptions of the formats 
of each of those systems will be covered 
in the next part of this article. 

In Britain and France (and in other 
countries related to them by culture or 
video standards) over 100.000 house- 
holds have been equipped for videotex. 
In addition, public videotex terminals 
have been tried on a limited basis. 

Both Prestel and Antiope have been 
sampled in this country, but the gen- 
eral and specific results of the tests are 
yet to be fully evaluated. 



The Canadian Telidon system is just 
starting to make its presence known 
here, although it has seen use in other 
parts of the world. Trials of Telidon 
are underway by organizations such as 
Time, Inc., the Times Mirror Cable 
Co.. and AT&T. The first intends to 
make as many as 24 "magazines" 
available over the system. AT&T 
has petitioned the FCC to make the 
Telidon system the U.S. videotex 
standard. 

Currently the EIA (Electronic /n- 
dustries Association) is developing 
a set of standards which it hopes will 
be adopted for use in this country. The 
FCC is expected to start evaluating 
that proposal this year. 

What's coming 

While it was probably conceived 
with the general public in mind, most 
applications of videotex to date have 
been directed to the businessman, 
who. it was felt, could well afford its 
services. 

As personal computers have proven, 
though (through the introduction and 
increasing use of the Source, MicroNet, 
and other, smaller, computer net- 
works), there are many individuals 
who want and need interactive infor- 
mation utilities. 

The "magazine" format would seem 
to indicate the response of large organ- 
izations to the public's wishes. Also, 



banks, whose managers previously felt 
that their computers might be "in- 
vaded" by personal computers, are 
beginning to open their doors to video- 
tex transactions, seeing the videotex 
system as a protective buffer between 
their systems and the users'. 

Along those same lines, owners of 
personal computers will soon be able 
to use local videotex systems (in both 
the interactive mode and the creative 
mode — where data, and not just re- 
sponses, can be entered into the sys- 
tem) with a simple addition to their own 
systems. Norpak of Canada has an- 
nounced a plug-in board for the Apple 
If computer for Telidon. Even better, 
there should be a module available 
soon for Radio Shack's TRS-80 Color 
Computer, since it uses the same 
microprocessor (the 6809) as the ter- 
minal that was originally designed 
for the Telidon system. You may soon 
be able to walk into your local Radio 
Shack store and walk out with a plug-in 
videotex system for under $500! 

As it proliferates, videotex will be 
the means by which you'll obtain the 
information you need, and transact 
your persona] business — as well as, 
perhaps, earn your living — without 
leaving home. It's part of the informa- 
tion revolution. 

Next month we'll discuss the tech- 
nology behind the various videotex 
systems. R-E 



Wheat's Pi< 



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46 



Electricity from coal, without 
pollution 

Dr. Richard Williams. Fellow of the 
technical staff of RCA Labs. Princeton, NJ. 
has patented a process that uses coal to 
produce electricity, without burning the 
coal, eliminating the air pollution that is 
normally caused by common coal-burning 
generators. 

The conversion is not direct. The pro- 
cess starts with passing steam over hot 
coal, producing carbon monoxide and 
hydrogen. (This process is used to make 
the so-called "water gas" used in many 
cities.) 

The carbon monoxide is then reacted 
with hot sodium hydroxide to form sodium 
formate that can then be used in a fuel 
cell to generate electricity. The remaining 
hydrogen is also usable in a fuel cell. 

Originally conceived about 150 years 
ago. fuel cells — in which the oxidation of 
a gaseous fuel produces electricity in a 
continuous process — have been used to 
provide energy for spacecraft. Now, be- 
cause of the energy shortage, they may 
be able to produce electricity economi- 
cally for many earthbound applications. 

Dr. Williams points out that a coal-fired 
steam plant can convert only about 30 
percent of the coal's energy to electricity, 
while producing undersirable pollution. 
The fuel cell can convert as much as 50 
percent of the coal's energy to electricity, 




Dr. RICHARD WILLIAMS Of RCA shows the 
steps in his method of using steam anil coal to 
produce electricity efficiently. 

without producing pollutants during the 
process. 

RCA will grant non-exclusive licenses 
to use the Williams patent. 

Cellular system for mobile two- 
way phone 

The FCC has granted approval to 
"cellular" mobile radlotelephony. In cel- 
lular communication, a service area — 
such as a city — is divided into small areas, 
called "ceils," each with its own low- 



power transmitter. Thus, a taxi company 
or other service would not need to cover 
an entire city with just one station; in- 
stead, it would use several .small ones. 
Each of those stations would be designed 
to cover its own "cell" efficiently while 
causing as little interference as possible 
in adjoining cells, As vehicles move from 
cell to cell, communications would be 
switched electronically from one trans- 
mitter to the next. 

The cellular approach will allow many 
more telephone calls to be handled at the 
same time than is possible with the 
present two-way phone service. Highly 
successful tests of the cellular system 
have been carried out under preliminary 
FCC rules by lllnois Bell in Chicago and 
by Motorola in Washington, DC. 

Radio common carriers are looking for- 
ward to the coming system with a mixture 
of anticipation and concern. Says Bernard 
Kahn. of a large Chicago communications 
service: "Cellular is so efficient that by 
the year 2000— at the least — it will carry 
practically all forms of portable communi- 
cations. We've been waiting for this 
moment for more than 10 years." 

Yet he expressed the fear of possible 
wire-line company domination that is 
worrying many independent common 
carriers. "Our greatest concern," he said, 
"is that the Bell System— directly or indi- 
rectly — might be handed a virtual 
monopoly on cellular systems. The FCC's 
own Common Carrier Bureau and the 
Justice Department have also gone on 
record with the same concern." R-E 




Low Frequency Filter 



'<>.. 




for your Hi-Fi 



As your sound system gets bet\ 

than you want to. This simple, low-cost filter will get rid of rumble 
and acoustic feedback without affecting the quality of the audio. 

By JOSEPH M. GORIN 



OVING AUDIO SYSTEMS ELECTRON- 

Sis what signaJ processors are 
Out; the LFF (Low Frequency 
i described here can improve 
uality Of reproduction from the 
ow-frequency end of your sound sys 
tern. The LFF helps eliminate three 
tydes of low-frequency problems: 
subaudible (too low in frequency to be 
heard) rumble, audible nimble, and 
acoustic feedback. By taking ad van I age 
of modern recording practices, and the 
characteristics of stereo discs, the 
LFF can filter out those annoyances 
without affecting the music. 

eo recording conventions 

\ stereo phonograph record uses 
oth walls of a groove to carry the 
ighl- and left-hand channel informa- 
iion. The continuously-changing po- 
sitions of those walls relative to the 
position of the stylus of your cart- 
ridge cause it to move and to gen- 
« electrical signals which eventual]) 
.-aid as sound. Figure I-a shows 
oss- section of a groove when only 
the right channel is modulated Notice 
how I he left wall remains stationary 
while the right wall moves. Also note 
that the stylus not only moves from 
side to side, but vertically, as well. 

In the days before stereo, both 
walls moved together horizontally, as 
shown in Fig. l-b. To permit stereo 



w 




FIG. 1— CROSS SECTION OF a stylus In a 
record groove during right-channel, hori- 
zontal (mono), and vertical (out-of-phase) 
modulation. 

equipment to play monophonic re- 
cordings, a monophonic signal was 
defined as one having equal strength 
in both channels, causing the left wall 
to recede while the right wall advanced 
(and vice versa), moving the groove 
only horizontally. 

Consider what would happen if the 
walls were lo converge, as shown in 
Fig. 1-c. A large signal could easily 
make the groove disappear, or cause 
distortion when the contact point of the 
stylus changed as the groove got 
smaller. Fortunately, that can only hap- 



pen with large out-of-phase signals, 
which, because phono pickups 
velocit) sensitive, tend to occur on 
low frequencies. 

When high-qualil} recording tech- 
niques — such as direct-to-dtsc — are 
used, long-wavelength, low-frequency 
signals occur only in-phase. since the 
microphones used ate closely spaced 
in comparison with the wavelength 
of -the sound, Large vertical excur- 
sions of the stylus will not take place 
under these conditions. 

When multi-track recording is used, 
though, many signals having a multi- 
tude of phase relationships are mixed 
together. To eliminate the possibility of 
oui-of-phase low-frequency signals 
finding their way onto a record 
dueed using multi-track equipment, a 
circuit similar to that of the LFF is 
used to make the low frequencies 
monophonic (in-phase) and avoid that 
situation. Pure-vertical audio signals 
are not found on most records 

Vertical noise, though, is another 
matter. There are two kinds ol 
frequency noise on a record — warp 
and rumble. All records, even the best, 
are warped to some degree. As the 
stylus tracks a warped record, it fol- 
ihe vertical excursion of the warp 
and passes that on to your system. 
Much Warp energy lies below audible 
frequencies and cannot be heard (al- 




FIG. 2— THE L-C NETWORK In this block diagram shorts ths left and right channels together at 
frequencies below 140 Hz, cancelling out-of-phese signals. 



massive head of the cutting lathe across 
the master disc (known as the lacquer) 
when it is being prepared. The vertical 
component of the noise from the bear- 
ings in the lathe is transmitted to the 
cutting head, and to the lacquer. Even- 
tually it winds up as part of your record. 

Direct and Indirect effects of noise 

The direct consequence of the ver- 
tical modulation of the record groove 
that we have been discussing is low- 
frequency noise that detracts from the 
quality of the sound (and our enjoy- 
ment of it). This direct effect, however, 
is quite rare. It is noticeable only in 
high-end systems that are capable of 




FIG. 3— SPECTRUM ANALYSIS of the "silent" 
groove of a record with considerable rumble. 
The upper curve is the Input to the LFF, the 
lower curve Is the output. 



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reproducing the bottom octave of the 
audio spectrum. 

The indirect effects arise from the 
larger-amplitude subaudible signals. 
They can cause vary large excursions 
of the speaker system's woofer. When 
the woofer's cone is displaced signifi- 
cantly, the sensitivity of the speaker 
changes. The result is intermodulation 
distortion caused by a mixing of the 
(normal) audio signal and the sub- 
audible one. The effect is especially 
bothersome in high-efficiency and/or 
ported speaker-systems. In high-ef- 
ficiency systems, the voice-coil/mag- 
netic-field overlap drops quickly as the 
cone is displaced, causing significant 
intermodulation distortion. In a ported 
system, because of the reduced "air 
load" on the woofer, nimble com- 
ponents below the system's resonant 
frequency cause very large cone ex- 
cursions, especially when compared to 
acoustic-suspension systems. 

A second indirect effect is reduced 
power reserves in the power amplifier. 
That is because a significant portion of 
the amplifier's output capability is 
being used to reproduce the subaudible 
signal. If the amplifier is driven into clip- 
ping, further intermodulation distortion 
will be introduced. 



2G 



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FHEuUENCY-Hi 



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FIG. 4 — THIS IS A spectrum analysis of the low- 
level, low-frequency Introduction to a song. The 
upper curve Is the Input to, the lower curve the 
output from, the LFF. Note how eudlo peak Is 
unchanged by filter. 



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Left 




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NOTE; 
POINTS LABELLED "A" THROUGH "K" ARE CONNECTED 
ACCORDING TO CONFIGURATION CHOSEN, SEE FIGS. 7,8,12 & 13. 



X1/4RC4I38 
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FIG. 5— FREQUENCY RESPONSE OF THE 
SYSTEM. Note how thoroughly the 30-dB peak 
(middle curve) Is removed by the LFF (upper 
curve). 

though it can affect your speakers), 
but many warps have an audible com- 
ponent as well. 

All turntables have rumble. It usually 
results from noisy motor bearings and 
its vertical component is picked up by 
the stylus. However, with a good turn- 
table, rumble is usually insignificant 
and is outweighed by the rumble cut 
into most records. That rumble exists 
because it is very hard to move the 




LEFT 
INPUT 



C8 
.1 




FIG. 6— THE KERNEL section of the LFF contains all of the filter circuitry. It can be Installed In an 
existing piece of equipment, or used aa part of a stand-alone unit. 



PARTS LIST 






Resistors V4 watt, 5% unless other- 
wise noted 

R1, R7, R8. R14— 56,000 ohms 
R2. R9— 15.000 ohms 
R3, R10— 750.000 ohms 
R4, P.11^70 ohms 
R5, R12— 47,000 ohms 
R6, R13— 1800 ohms 
R15-R 17— 220,000 ohms 
R 18— 220 Ohms 
R19, R20— 560 ohms 

Capacitors 

C1-C3, C7-C9— .1 fiF, 5%. polyester f itm 
C4. C5, C10, C1 1 — 2,2 tip. 10%. tan- 
talum 
C6, C12— 01 ^F 10%, polyester film 
C13, CM, C17— .1 nF, 50 volts, ceramic 

disc 
C15, C16— 10 fiF. 25 volts, aluminum 

electrolytic 
C18 — 220 uF. 35 volts, aluminum 
electrolytic 

Semiconductors 

IC1— RC4136 quad op-amp 
D1-D4— 1N4002 

J1-J8— chassis-mount phono jacks 
S1-S8— DPDT miniature toggle switch 
T1 — wall plug transformer, 12-24 volts 
AC, 100 mA 

Miscellaneous; PC board, chassis, 
hardwood end panels, hardware, wire, 
etc. 

Note: The following are available from 
Symmetric Sound Systems, 912 
Knobcone Place, Loveland, CO 80537. 
Complete kit, model LFF-1 with un- 
finished walnut end panels; S50.00 
(Canada, $55,00 U.S. funds); model 
LFF-Kemel with R1-R20, C1-C12, 
IC1, PC board, and miscellaneous 
wire and hardware, S 15.00; model 
LFF-PC prlnted-clrcuit board only, 
$7.00. All prices Include UPS shipping 
In the U.S. on prepaid orders. Visa and 
M/C, add $1.00 handling and all 
shipping charges. U.S. mall, add $3.00 
for the LFF-1 only. Colorado residents, 
add 3% sales tax. 



The obvious solution 

There is a simple remedy for the 
problems just described— make the 
system monophonic at low frequencies 
and. for added protection, roll off its 
response below the range of normal 
hearing. This will have no effect on the 
program material — just on the noise. 
If the circuit is well-designed, it will not 
alter the stereo effect either, because a 
listener's perception of localization 
(imaging — the stereo effect) is based 
on frequencies much higher than the 
ones that will be filtered out. The LFF 
switches from stereo to mono at about 
I40 Hz. with a moderately rapid transi- 
tion. 

Figure 2 is a block diagram of the 
LFF. Both channels have I8-db/octave 
rapid-cutoff filters for subaudible signals 




FIG. 7— FULL-WAVE BRIDGE POWER supply for a stand-alona LFF, The bias voltage (halt the supply 
voltage) Is connected to pin H of the kernel. 



1S-35V0O 



1C1 
T* , 



F 
GND*- 



E 

+12V-*- 



GND- 



CU 
'.1 

_^ TO PIN 7, 
IC1 



G 
-12V -^ 



.TO PIN 11. 
' 1C1 



C13 
.1 



C14 

,1 



+3uV « . »Tn«K11, 

IG1 

GNQ* n -. 

ii-Ctt 



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ici m r 

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(SEE TEXT] r SR7 

a b e 

FIG. 8— HOW A POWER SUPPLY Is connected to the kernel section of the LFF. Connections for a 
stand-alone unit are shown In a. The LFF can also be built Into an ASRU using the connections 
shown In 6, or a graphic equalizer using the connections shown In c. 



below 15 Hz. The right and left chan- 
nels are then combined by a network 
made up of Cl. C2, and LI. At low 
frequencies, the impedance of the 
capacitors is large and that of the in- 
ductor is small, so that the two chan- 
nels mix into one and out-of-phase 
signals cancel each other. At higher fre- 
quencies, the relative impedances 



reverse and the channels remain sepa- 
rate. The result is effective filtering of 
only the noise. 

To get an idea of what the LFF does 
to subaudible noise, remove the grille 
cloth from one of your speakers and 
watch the cone of the woofer while 
switching from stereo to mono. You'll 
be able to see the rumble disappear. 



2 

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49 





TABLE 1 Jf 


Crossover frequency: 




140 Hz 


Subaudible filter: 




18 dB/octave below 20 Hz 


Frequency response: 




20Hz-20 kHz ±1 dB, both channels driven 


Differentia) rumble rejection: 




20 dB @ 20 Hz 


Separation: 




25 dB above 1 kHz: 35 dB above 3 kHz 


Rated output: 




,5-volt RMS 


Signal-to-noise ratio: 




100 dB 


Total harmonic distortion. 20 Hz - 


- 20 kHz- 


,02% 


Maximum output: 




Greaier than 5-volts RMS: depends on 
power supply. 




•2-1/2 INCHES- 



H 



FIG. 9— FOIL PATTERN required for the small 
PC board is shown here full size. 



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FIG.1 — ALL PARTS except the wall-plug transformer, switches, and jacks are mounted on the PC 
board as shown. 



Acoustic feedback 

The LFF can also reduce the effects 
of acoustic feedback. Acoustic feed- 
back is caused by sound from the speak- 



i 
ers causing the pickup to vibrat^- The 
vibrations are treated like a signal and 
are fed back to the amplifier. In serious 
cases, the system will "take off' and 




go into oscillation ^VBflH D ' un * e ls 
turned up. Evci \\ hod the mvmi level 
is well below tie po™»rnere oscilla- 
tion would take place, ^Beedbact can 
cause aberrations in a system's fre- 
quency response that retewlt in an "over- 
hang" or "ringing" «(fect on bass 
transients a"nd dull their impact and 
muddy the sound. 

The main component is usually ver- 
tical and can be reduced by the LFF. 
You can simulate the effect of the filter 
by placing a record on your turntable — 
with the, turntable turned off— and 
lowering ^he stylus onto the disc. Tap 
the baser of the turntable with your 
finger as you increase the setting of 
your amplifier's volume control. Feed- 
back should occur. If you put the 
amplifier in the "mono" mode, the 
Feedback should disappear. 

Performance 

Figure 3 shows a spectrum analysis 
of the signal generated by a "silent" 
record groove that contains a significant 
amount of cut ting-lathe-induced rumble. 
The upper curve is the signal input to 
the LFF and the lower one the output. 
The difference between the two is quite 
dramatic. 

Figure 4 is another spectrum analysis 
showing the low-frequency, low-level, 
introduction to a song. The sound peak 
is reproduced equally well at both the 
input and the output; the noise that 
would normally be bothersome is great- 
ly attenuated by the filter. 

The frequency-responsfc curves for a 
sound system are shown in Fig. 5. The 
lowest curve shows the results of a 
measurement made with the volume 
control turned down. The next higher 
curve (displaced for clarity) shows 
a 30-dB peak at the edge of oscilla- 
tion. The narrowness of the peak implies 
that the system will ring for seconds 
after the end of the transient. The top 
curve shows the nearly complete re- 
moval of that peak by the LFF. 

Table one lists the LFF's per|brmance 
characteristics. 

Circuit description 

Schematics for the LFF are shown 
in Figs. 6 and 7. Figure 6 shows the 
main circuitry, or "kernel," suitable 
for installation in existing equipment. A 
power supply and other circuitry needed 
to construct a stand-alone unit are 
shown in Fig, 7. Figurq 8 shows power- 
supply connections to^the kernel. Use 
the connections showit in Fig. 8-a for a 
stand-alone unit and those shown in 
Figs. 8-b and 8-c for use as pari of 
another piece of equipment. Those con- 
nections will be discussed in more de- 
tail later in this article. 

The subaudible-noise filter is made 
up of RI-R3, C1-C3, and ICl-a, The use 
of three R-C pairs allows a steep 18- 
dB/octave rolloff; the controlled amount 




FIG. 11— THIS IS HOW the PC board should 
look when all components are in place on the 
board. 



M It II 

9 TT v ir 




FIG. 12— AN UNDERSIDE VIEW of the LFF 
stand-alone unit. The kernel board cart also be 
Installed inside a piece of existing equipment. 



of positive feedback through R2 helps 
keep the response of the device very 
Flat down to 20 Hz. 

Capacitors C4-C6, resistors R4-R6 
and ICI-b perform the functions of CI. 
C2. and L.I shown in the hlock diagram 
in Fig. 2. Capacitor C4 is the diagram's 
CI, and C5 is the diagram's C2. The 
inductance represented by LI is sup- 
plied by R5. R6. C6. and ICl-b in a 
circuit configuration known as a gy- 
rutar. It simulates an inductor with a 
value of L = 1/R5 x R6 x Cfi between 
pin 12 of ICl-c and the junction of 
resistors R4-R6. with a resistance 
equal to (R5 x R6)/<R5 + R6) across 
the inductance. That configuration 
offers an inductance of 1. 2 henries 
without the typical problems of satura- 
tion, poor tolerance, hum pickup, and 
high cost. The resistance of the in- 
ductor, together with that of R4 in 
series with it, damps the L-C resonant 
circuit to prevent ringing. 

Construction 

Figures 9 and 10 are the foil pattern 
and parts-placement diagram for the 




J7 
HT OUTPUT < 



OUTPUT ■ 
RESISTOR, 



FILTER 
KERNEL 



OUTPUT 
RESISTOR 



J6 



X 



LEFT OUTPUT © 







FIG. 13— THE LFF can be installed in an ASRU using the connections shown above and In Fig. 8-b. 
It that is done, the power-supply circuit is not required. 




FIG. 14— IF THE LFF IS INSTALLED in a graphic equalizer, be sure to connect the LFF ahead of the 
equalizer. 



LFF. The kernel (on ihe upper pan of 
(he board} is attached to the power 
supply on the bottom part by jumpers 
to the holes marked "H." "F," "G." 
and "E." 

Assembly is quite simple. To build 
a stand-alone unit, refer to Figs. 10 and 
1 1 and mount all the components on the 
board. Install the finished board in a 
plain enclosure and wire it to the jacks, 
switches, and wall -plug transformer as 
shown in the schematics. Any wall-plug 
transformer with an output of 12-24 
vol Is AC can be used — short out RI8 if 
the transformer supplies 18 volts or 
less. Be careful to observe the po- 
larities of the electrolytic capacitors 
and the diodes, and to position the IC 
correctly. The completed unit is shown 
in Fig. 12. 

The LFF can be connected to any 
sound system with a tape monitor 
switch. Connect the LFF's inputs to 
tape Record or tape out on your 
amplifier and its outputs to tape pi. ay 
or tape monitor. Anything that had 
been connected to these jacks can now 
be connected to the corresponding 
jacks on the LFF, maintaining your 
sound system's full capability and 
flexibility. 

Installation in existing equipment 

The LFF is such a simple circuit 
that the overhead of a chassis, end- 
panels, power supply and switches 
begins to look ridiculous. The board 
can easily be installed in existing equip- 
ment; the graphic equalizer and ASRU 
noise-reduction units, which were, 
presented in Radio- Electronics in May 
1978 and March-April 1981 respectively, 
will be used as examples. 

A dual-supply connection is shown 
in Fig. 13, which uses the ASRU as an 
example. The bias voltage, V B , is con- 
nected to ground and op-amp IC1 uses 
the ±l2-volt supplies. Figure 8-b 
shows the connections to points "E," 
"F." "G," "H."and"K," 

Figure 14 shows how the LFF can be 
installed in an equalizer with a single- 
ended power supply. The connections 
for that arrangement are shown in Fig. 
8-c. In that example, V B (+15 volts) 
can be obtained from the equalizer. In 
other circuits, where no V B exists or 
can be located, R15-R17. Cl5, and 
C16 can be used to derive V B from Vqq. 
It is important that the LFF be con- 
nected ahead of the equalizer, since 
mismatches in the low-frequency band 
settings of an equalizer produce phase 
shifts that can reduce the effectiveness 
of the filter. 

There you have it — a simple, inex- 
pensive circuit to help wipe out warps, 
nimble, and the howl and muddiness 
caused by acoustic feedback: it is 
equally effective as a stand-alone unit, 
or when incorporated into an existing 
piece of equipment. R-E 



z 
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03 
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31 






MmjH 



IS IT POSSIBLE FOR AN ANALOG METER 

to rival digital accuracy, yet not cost an 
arm and a leg? Sure — with a nearly for- 
gotten technique known as expanded- 
scate operation. 

As a matter of fact, here's a scale ex- 
pander you can build for less than the 
price of the cheapest DVM, Easily con- 
structed and easier to operate, it'll put 
an ordinary VTVM to shame. Besides 
being accurate, it's smart. It will tell 
you if you are ' 'over-ranging' ' and pro- 
tect the movement from damage if you 
are. It will even recognize AC voltage 
and IX! polarity-reversal. 

Expanded-scale theory 

A major drawback of conventional 
instruments is the necessity of selecting 
the most appropriate scale to measure a 
particular voltage. If you wish to 
measure 55 volts, let's say, it gets a bit 
tricky. 

The 50- volt scale is too small — the 
needle pegs — so, you have to switch to 
the next range — 150- volts. Unfor- 
tunately that places your reading in the 
bottom third of the meter — the most in- 
accurate portion. 

Why put up with this, when all 
you're really interested in is a portion 
of the scale — -not the whole 150-volts 
worth? Why not start at 50 volts and set 
the upper limit at 60, for a total range of 
only 10 volts? In other words, the 
pointer won't budge until the input ex- 
ceeds a minimum value, and then will 
be read against a much more accurate 
scale? 

The always -useful op-amp will per- 
mit you to do just that. Using the am- 
plifier in a standard inverting configura- 
tion, as shown in Fig. 1 , you'll have a 
voltmeter... nothing fancy, but the basic 
building block of our unit. 

Apply a voltage and the meter will re- 
spond. When it gives a full-scale read- 
ing, then that's the limit... right? 
Wrong! We can "zero" the meter and 
measure higher voltages by a method 
called junction summing. A summing 
amplifier is shown in Fig. 2. 

The output of a summing amplifier is 
the algebraic sum of all the inputs. So, 
when the output reaches maximum, we 
can inject a voltage of the opposite 
polarity into one of the summing resis- 
tors... just enough to make the sum of 
the inputs equal to zero. Now we can 
increase the input voltage and still ob- 
tain an on-scale meter reading. 

After reaching the next plateau, we 
can connect another summing resistor, 
re-zero the meter, and be able to read 
still-higher voltages. 

We now have an input voltage three 
times that of the meter's full-scale 
capacity; yet we are still using the 



Build an analog 
voltmeter with a scale 
equivalent to 
one 36 inches long! 
The meter also 
features reverse-polarity, 
over- load indicators 
and protection, and 
a special circuit for AC. 

T. J. BYERS 




original, more precise, scale. That can 
continue indefinitely since the inputs 
don't interact. (Of course there's a 
practical limit!) 

How it works 

Basically that's how our meter 
works — but we've added a few im- 
provements. Resistors R6 and R7 (see 
Fig. 3) determine the gain of the stage, 
with R6 also providing the input im- 
pedance. Resistors Rl through R5 are 
the summing resistors. 

The upper limit of our instrument has 
been set at 120 volts, with 10-volt incre- 
ments. (150 volts is the absolute maxi- 
mum; beyond that, you run the risk of 
damage to the op-amp.) This means 
that 1 1 summing resistors are necessary 
for proper operation. Although that 
would be true ordinarily, we can reduce 
the component count by taking a hint 
from binary math. 

Resistor R 1 is selected to match one 
unit exactly, and R2 to match two 
units, of reverse voltage — which means 
that the combination will be three units 
(sound familiar?). 

Accordingly, R3 is four units, and R4 
(which is actually two resistors in 
parallel — R4 and R5) is eight. (The sche- 



matic refers to R4-R5 as R4). Now, by 
paralleling different combinations of 
those resistors, we can develop any 
summing current from one to sixteen 
units. That's exactly what the range 
switch, SI, does. 

This leaves us with one smalt prob- 
lem. Let's assume we've input 70 volts 
and properly compensated for it with 
the biasing inputs — and then remove 
the input. Zap! There goes the meter 
movement . . . backwards ! 

To prevent that, we'll include a tran- 
sistor, Ql. It is normally reverse-biased 
and doesn't enter in the performance. 
But let the voltage go just a little nega- 
tive and the transistor saturates — 
shunting the op-amp's output to ground 
and saving the meter's life. 

We've also protected our monitor 
from forward overloads with diodes 
D I , D2 and LED 1 . As long as the out- 
put from the op-amp is under about 2.5 
volts, the diodes won't conduct. Once 
it exceeds the diodes' combined for- 
ward voltage, the LED lights — indi- 
cating overload — and clamps the out- 
put, again rescuing the movement from 
harm. 

Resistors R28 and Rl 1 are for calibra- 
tion. Potentiometer R27 is mounted on 



52 




. 1— AN ORDINARY OP-AMP is the heart of the expBnded-scale voltmeter, Resistors R (N end R F 
set the gain. 



-* — Wr 
-» — W»r- 



-»■ — ^^v- 



"IN 



■'M- 








FIG. 2— A SUMMING AMPLIFIER works on the basis that the total input Is the algebraic sum of the 
Individual Inputs. 




the front panel and nulls the input amp. 

The voltage for the summing resis- 
tors is obtained from IC2-b, a Norton 
amplifier operating from only one sup- 
ply voltage — positive. Resistor R19 
limits the Zener current, which is used 
to reference the inverting input. Poten- 
tiometer R29 controls the output. 

In order to educate our machine, an 
amplifier, ICl-b, is used as a compara- 
tor. Resistor R13 provides an input im- 
pedance. If the input is negative (nega- 
tive, in our case, is proper operation), 
it swings the comparator's output posi- 
tive — to the limit. 

Light-emitting diode LED2 is a spe- 
cial tri-color device with two lamps in 
one case. Internally, the diodes are 
connected in parallel with opposite 
polarities. The device works in the fol- 
lowing manner: with current flowing in 
one direction the unit glows green; re- 
verse the flow and it's red. Light both 
diodes and it's yellow! 

So. we connect the LED so it glows 
green with a negative input. If we apply 
a positive input, the comparator swings 
negative... lighting our red lamp. That 
signals that the leads are reversed. An 
AC voltage will cause the LED to glow 
yellow. 



AC too? 

You bet! The expanded voltmeter 
will also measure AC. Our clever 
clamping device, the transistor, also 
serves as a rectifier by clipping the 
negative peaks. 

Because the expanded function off- 
sets the input voltage the way it does, it 
distorts the AC waveform. As the input 
voltage increases, the half sinewave 
narrows — you're sampling closer and 
closer to the top. 

A simple solution: Use a peak detec- 
tor. The peak value is independent of 
the pulse width, eliminating the prob- 
lem of the meter's averaging the pulses 
and giving erroneous readings. 

The Norton amp (IC2-a) receives the 
pulsating DC from the main amplifier 
through R24, which, in conjunction 
with R25, sets the gain at unity. As the 
level of the input waveform rises, so 
does the voltage across C 1 , until a peak 
is reached. 

Diode D3 performs two functions. 
First, it references the output to ground; 
in other words, it removes the offset 
voltage... with a little help from R22 and 
R23 (R31 is zero adjust). 

Secondly, it isolates capacitor CI 



from the output, allowing it to charge to 
the peak voltage — but as the input volt- 
age decreases, D3 becomes reverse 
biased, thus making it impossible for 
the capacitor to follow the decline. The 
capacitor remains charged at the peak 
input voltage and slowly discharges 
through R30 and R26, the calibration 
resistors which, we should add, are ad- 
justed for RMS — not peak — reading. 

That fact requires the addition of an- 
other bias supply for the summing re- 
sistors, since our range per step has 
changed — it's 1 .4 times that of the indi- 
cated value on the AC ranges. The AC- 
bias supply is IC2-C and works in the 
same way as the DC supply. (Zener 
diode D5, R21. and R32 are the asso- 
ciated parts.) 

Because the forward voltage on the 
base of the transistor must be exceeded 
before clipping begins, AC voltages in 
this area are non-linear. (That only hap- 
pens on the first portion of the lowest 
range.) A transistor was selected instead 
of a diode because once the transistor 
saturates, it effectively shorts the signal 
to ground while a diode would still 
carry the forward offset voltage, per- 
mitting the output to dip below ground. 

Construction 

Layout isn't critical, so you can 
duplicate the unit in almost any manner 
that pleases you. A printed-circuit board 
layout and parts placement diagram are 
shown in Figs. 4 and 5 for those wish- 
ing to go that route: however, the 
prototype was fabricated on perforated 
construction board. 

If you elect not to use the PC board, 
try to keep the calibration pots along 
the edges for easy access. The case is 
large enough so that crowding isn't a 
problem. We suggest using sockets for 
the IC's, 

Even though ICI's input impedance 
is fairly high (about 1 megohm), it might 
not be high enough to satisfy your re- 
quirements. Unplug the 1458 IC and re- 
place it with an LF353N— it has FET 
inputs. Change RI5 to 2 megohms and 
R16 to 10 megohms. You may have to 
change (reduce) the value of R7 to re- 
store the original amplification. Voila! 
This is liable to out-perform any volt- 
meter you'll run across for some time! 

Resistors R4 and R5 are two 750 K 
units in parallel to obtain the non- 
standard value of 375 K. Any combina- 
tion will work: 300K and 75K in series, 
360K and 15K in series, etc. 

The meter mounts on the front panel, 
and is then bolted to the foil side of the § 
circuit board, so make sure when posi- je 
tioning it that everything lines up. 3 
Speaking of meters, the accuracy of the ^ 
system is limited only by the meter. 2 

53 



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FIG. 3— SCHEMATIC OF EXTENDED-RANGE VOLTMETER. Circled letters refer to connection points 
on board. 



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6 
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Mz&fc&M 




■5-1/6 INCHES- 



FIG. 4— PC BOARD will tit comfortably In a 6Vi x 3%-lnch box. 




IBM I \M2~\ Q30J |R31J (R29 
FIG. 5— MOUNT TRIMMER POTS R28-R32 so they can be adjusted from outside of board. 



50V-60V 



60 -70 V 



A 
T0R1 



70- 
80V 



80-90 V 

304 0V 
20-30V 



B 

TO R2 

* 



C 

TO R3 



10-20V 



D 

TO 
FW.R5 

i 



10D- 

110V 



Sl-b 



1 



110-120V 



■% ! 



J 



Sid 



rr 



S1-c 



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OFF 



S2-a 



-*- E 



DC 

£2£. 

AC 



SI: RADGE 

S2: POWER / FUHCTION 

FIG. 6— WIRING FOR SWITCH S1 and one section of S2. Switches are mounted on enclosure and 
connected to points A through F on PC board. 




FIG. 7— WIRING FOR FOUR of the six sections of switch S2. This swltcn Is used to select mode of 
operation and to turn unit on and off. 



The movement specified is a standard 
panel unit, but any equivalent can be 
substituted. Resolution is limited only 
by the meter you select and your 
pocketbook! (Taut-band, mirrored-scale 
devices don't come cheap.) 

Switch wiring is shown in Figs, 6 and 
7. When routing the wires to the panel 
controls, use ribbon cable. It definitely 
makes for a neater package and there's 
less chance of committing an error. The 
LED's are placed in holders and the 
leads spliced. Slip a piece of spaghetti 
or shrink tubing over the exposed 
splices. 

Observe diode and capacitor polarity, 
and follow good work habits in general 
when soldering. Figure 8 shows the 
completed board. Keep the input wire 
to a minimum to avoid noise. Either run 
a ground wire alongside it, if you're 
using ribbon cable, or use coaxial cable 
to reduce stray coupling. 

The instrument is powered by two 
9-volt batteries; mercury cells should 
be used since their voltage remains 
stable throughout their useful life. The 
on/off switch is incorporated into the 
function selector, S2. 

Calibration 

Familiarize yourself with the calibra- 
tion controls. Potentiometer R27 is the 
overall zero-set and is mounted on the 
front panel. DC calibration is done 
using R28. and R30 is the AC -adjust. 
Potentiometer R31 is for AC null, or 
zero. The bias offset, the function 
which gives our instrument its expanded 
scale mode, is controlled by R29 and 
R32 — DC and AC respectively. 

First you must zero the instrument. 
Switch the function selector to +dc 
volts and the range to the lowest scale, 
0-10 VOLTS. Adjust R27 for zero. (Of 
course, you've already mechanically 
zeroed the meter before applying 
power.) 

Apply 10- volts DC to the input. Since 
that is the most critical adjustment, the 
accuracy of the instrument will directly 
depend on how precise your reference 
is. Adjust potentiometer R28 for full- 
scale deflection. 

Move the RANGE switch to the next 
range (10-20 VOLTS). Now, turn pot R29 
until the meter again indicates zero, and 
that's it! Well, the DC part anyway. 
You may have to strain your eyes a 
little to insure that your initial calibra- 
tion is right on the button — as the ranges 
progress, any small error will be signifi- 
cantly magnified. 

Assure yourself the meter is nulled 
and switch to the AC function. Set the 
range switch to the lowest range. 
Using R31, zero the meter; it's impera- 
tive you set the overall zero in the dc 
position prior to trimming the AC pot— 
they are two different amplifiers with 
two offsets! 
Place a 10- volt RMS sine wave across 



i 
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00 

m 

is 

03 



55 



A SIMPLE EXPANDED-SCALE VOLTMETER 

A SIMPLE EXPANDED-SCALE METER CAN BE MADE USING A ZENER 

diode. (As shown in Fig. 9.) 

The diode is normally reverse-biased and little current 
flows in that mode. However, as the voltage across the 
Zener is increased, a point is reached where the diode 
begins conducting — heavily. This voltage is called the 
breakdown voltage. 

When breakdown occurs in normal diodes, they are 
destroyed. But, Zeners are heavily doped to permit the 
reverse conduction. A resistor is placed in series with the 
regulator to limit the current flow. Once the diode con- 
ducts, the series resistor drops voltage according to 
Ohm's law — minus the Zener voltage! 

Suppose the Zener is rated at 10 volts. Up to the point 
of 10-volts input, no current flows through the resistor 
and no voltage is developed. After the 10-volt threshold is 
reached, and the Zener conducts, the current through the 
resistor generates a voltage. 

A meter across the resistor will measure that voltage. 



TO 

VOLTAGE <; 
SOURCE 



© 



ZENER 
DIODE, 



IE- 



METERI 



FIG. 9— A SIMPLE ex- 
pa nded-scale voltmeter 
can be made using Just 
a Zener diode and a re- 
sistor. Add a conven- 
tional diode and you 
have an AC line-voltage 
monitor. 



The meter can have any scale desired — if it is a to 10- 
volt meter, it becomes a 10- to 20-volt meter when used 
with a 10-vo(t Zener diode. 

The Zener is, unfortunately, a low-impedance device 
and it takes a tidy sum of current to begin to induce an 
avalanche condition. This more or less restricts its use to 
power-supply monitors. By inserting a conventional diode 
in series with the Zener, you rectify the input-voltage — 
making the meter particularly attractive as an expanded- 
scale AC line-voltage monitor. 



o 

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tr 

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HI 

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56 



PARTS LIST 

All resistors Vi-watt, 5% 

R1, R22, R23— 3 megohms 

R2, R6 — 1.5 megohms 

R3-R5— 750,000 ohms 

H7— 560.000 ohms 

R8— 12,000 ohms 

R9 — 470 ohms 

R1 0—1 0,000 ohms 

R1 1—2200 ohms 

R12— 100 ohms 

R13. R16, R24, R25— 1 megohm 

R14. R19, R21— 660 ohms 

R15— 120.000 ohms 

R20— 15,000 ohms 

R26— 1800 ohms 

R27 — 50,000 ohms, potentiometer, panel- 
mount 

R28, R30 — 1000 ohms, trimmer potenti- 
ometer, vertical-mount 

R29, R32— 50.000 ohms, trimmer potenti- 
ometer, vertical-mount 

R31— 500.000 ohms, trimmer potenti- 
ometer, vertical-mount 

Capacitor 

C1— 50 mF, 25 volts, electrolytic 

Semiconductors 

IC1 — LM1458 or LF353N dual op-amp 
(see text) 

IC2— LM3900 quad Norton amp 

Q1— 2N3906 

LED1— jumbo red LED 

LED2— tri-color LED (also known as 
bi-polar LED) 

D1-D3— 1N4001 

D4 — 3.4-volt Zener diode 

D5 — 6,2-voit Zener diode 

MT— 0.1 mA panel meter (Radio Shack 
270-1752 or equivalent) 

S1 — 4-pole, 12-position rotary switch 
(Centralab PA-2012 or equivalent) 

S2 — 6-pole, 4-position rotary switch 
(Centralab PA-2021 or equivalent) 

Miscellaneous: IC sockets, binding post, 
enclosure, two 9-volt mercury batteries, 
battery clips, ribbon cable, LED holders, 
solder, etc. 

An etched and drilled PC board is avail- 
able from: Danocinths, Inc., P.O. Box 261, 

Westland, Ml 48185 for S9.40 plus $1 .25 for 

postage & handling (order No. HS1F-36). 

Mi residents please add 4% sales tax; 

allow four weeks for delivery. 




FIG. B— COMPLETED BOARD ready to be In- 
stalled In box. Note how ribbon cable keeps 
things neat. 

the input leads and adjust R30 for full- 
scale deflection. Move the range 
switch to the next position and adjust 
R32 for a zero reading. The same re- 
quirements apply here as they do in the 
DC calibration. 

The AC amplifier won't go below 
ground — the zero on the meter. Keep 
that in mind when setting R32. Turn the 
control to obtain an indication above 
zero, then back off the pot until it just 
reaches the line. If you retard it any 
further, you won't know it because you 
will not get a reverse indication on the 
meter! 

Using the instrument 

Button everything up, inserting the 
batteries first, and apply power. There's 
nothing tricky about using the expand- 
ed-scale voltmeter. 

With the range switch in the lowest 
position, the LED will glow green with 
no input. Now apply a voltage across 
the leads. Right away the meter, which 
is now pretty smart, will tell you quite a 
bit about your input. 

If the polarity is correct, the tight will 
remain green; if not, it changes to red, 
indicating that the leads are reversed. 
The situation can be easily remedied by 
twisting the function knob to the —DC 
volts setting. 



If the voltage is higher than the scale 
capability — for example, 45 volts on 
the 0- 10-volt range — the overload 
LED, LEDI , will glow. Since the meter 
is fully protected from overloads, it 
won't be harmed. Simply switch through 
successively higher ranges until the 
lamp goes out. 

In that example it will go out at the 
40-50-volt range, so you know the volt- 
age is between those figures. Merely 
take the meter reading, in this case 5, 
and mentally add it to the lower number 
of the range (40-50) you are using; 
hence, 40 + 5 for 45 volts. 

If the polarity LED glows yellow, 
this indicates that you have an AC volt- 
age present. Turn the function switch 
to AC voi.TS and proceed just as you 
would with a DC voltage reading — ex- 
panded scale and all ! 

Below 2 volts, the AC scale is non- 
linear- — but then, most AC meters are, 
and special scales are required. If that 
bothers you, or you wish to measure 
those low-level signals with this instru- 
ment, there's an unused amplifier in 
IC2 that could be used. 

However, for voltages that low, a 
good AC mill i voltmeter would probably 
be the best bet. 

The \C scale has another unique char- 
acteristic: it's peak reading. 

That means you can measure any AC 
voltage, any waveform (yes, even 
pulses, if the repetition rate is high 
enough), and obtain a peak reading. 
The value will have to be multiplied by 
1.414 since we calibrated for sinewave 
RMS. But, you can calibrate for peak 
voltage by using 10-volts peak instead 
of RMS as a reference. Zener diode D5 
will have to be changed to a 3.4-volt de- 
vice. 

If you calibrate your expanded-scale 
voltmeter for peak volts, an RMS value 
can be found easily by multiplying the 
reading by 0.707. R-E 



f«»E 




JOSEPH J. CARR 



Temperature Measurement- 



WE'VE BEEN ABLE TO MEASURE TEMPERA- 

ture electronically for many years but 
only recently have the circuits to do that 
been readily available. In this article, we 
will discuss some of the more common 
temperature-sensitive transducers, the 
circuits needed to make them work, and 
will introduce you to several integrated 
circuit temperature-transducer/amplifier 
combinations. Several semiconductor 
manufacturers now make two-terminal 
temperature devices that are very easy 
to use. 

Temperature transducers 

There are several different types of 
transducers that will convert a tempera- 
ture to either a voltage or a current. 
Once the conversion is made, we can 
use amplifiers and voltmeters to process 
and display the result. 

One of the earliest forms of tempera- 
ture transducer was the thermocouple. 
If we form a junction of two wires of 
different metals as shown in Fig. 1 , we 
will note a very interesting phenomenon 
called Seebeck effect. When the junc- 
tion is heated, a voltage proportional 
to the temperature of the junction 
is developed across the two wires. 
That voltage can be measured and used 
to determine the temperature of the 
junction. 

The voltage produced in a thermo- 
couple is created by the different work 
functions of the two metals. Over the 
years, certain standard sets of metals 
have been defined for use in thermo- 
couples and each standard set has its 
own temperature characteristics and 
applications. 

Another very popular form of tem- 
perature transducer is the thermistor, or 
THERMa] resISTOR. That device has a 
resistance that is a function of tempera- 
ture (Fig. 2). There are positive temper- 
ature-coefficient thermistors, with a re- 
sistance that rises with temperature, 
and negative temperature-coefficient 
thermistors, with a resistance that de- 



POSITIVE TEMP. COEFFICIENT 




FIG. 3— THE CURRENT through a pn junction is 
dependent on temperature. To demonstrate 
that, connect an ohmmeter across a diode as 
shown, grasp the diode in your hand, and note 
the change in resistance. 

OHMMETER 



TEMPERATURE 



FIG. 2— AS THE TEMPERATURE goes up, the 
resistance of a positive temperature-coefficient 
thermistor also rises. The resistance of a nega- 
tive temperature-coefficient thermistor drops 
with rising temperature. 




FDRWARQBIASED 
DIODE 



Circuits 

and Components 

It's easy to put together a temperature-measuring circuit 

if you know a tittle basic electronics. 
Here are several ideas to get you started. 



creases with temperature. The temper- 
ature-resistance curves for most therm- 
istors are not linear (i.e., straight-line). 
That makes it difficult to use thermistors 
for accurate temperature measurement 
unless we use them only over the nar- 
row range in which they are linear, or 
use an external-resistor linearizing net- 
work to make the curve straighter. 

A typical thermistor electronic ther- 
mometer uses a Wheatstone bridge, 
with a thermistor as one of the bridge 
legs. The output voltage will be zero 
under a null condition — usually 0° C — 
and is approximately proportional to 
the temperature at other points. A 
differential op- amp can be used to am- 
plify the. small output-voltage, and to 
scale the voltage to some level that is 




FIG. t — WHEN A JUNCTION of two dissimilar metals is heated, a voltage that is proportional to the 
temperature of the junction Is created. 



easy to display on an analog or digital 
voltmeter, such as 10 mV/°K (Kelvin). 

In recent years, semiconductor tem- 
perature-transducers have become in- 
creasingly important. We know that the 
voltage across a pn diode-junction, 
and the current flow through the junc- 
tion, is strongly affected by tempera- 
ture. (That property is what causes drift 
in solid-state amplifiers.) We can 
demonstrate this with an ordinary sili- 
con diode, say one of the IN4000 series. 

Connect an ohmmeter across the 
diode (Fig. 3) so that the diode is for- 
ward biased. That means connecting 
the positive terminal of the ohmmeter to 
the anode of the diode, and the nega- 
tive terminal of the ohmmeter to the 
cathode. In case of doubt, the correct 
connection is the one that shows the 
lowest resistance on the xi, xiO, or 
X 100 scale of the ohmmeter. Note the 
ohmmeter reading, then apply heat 
(body heat is sufficient — grab hold of 
the diode and squeeze it in your palm) 
and watch the resistance change! 

Although diodes are often used as 
temperature transducers, they are not 
always the best choice. In many cases, 
an ordinary bipolar transistor will make 
a better transducer, especially if it is 
diode -connected. (The collector and the 
base are shorted together to form one 



57 



terminal of the "diode;" the emitter is 
the other.) 

The base -emitter voltage of a transis- 
tor (V BE ) is dependent on both the col- 
lector current and the temperature. (If 
you're interested in the math you can 
find the formula in any good text on 
transistors.) Because of that, a transis- 
tor can be used to make a very linear 
temperature transducer that works over 
a range of approximately —55° C to 
+ 125° C. 

Transistor temperature transducers 

Almost any transistor can be used to 
make rough measurements of tempera- 
ture because of the relationship be- 
tween the base-emitter voltage and 
temperature, when the collector current 
is held constant. But, some transistors 
are better temperature transducers 
than others. It seems that transistors in 
metal can-type cases (TO-5 and espe- 
cially the smaller TO- 18) have a better 
response than most epoxy or plastic- 
cased transistors. In addition, some 
transistors have a more linear V BE vs. L; 
curve than others. 

Figure 4 shows a simple temperature 
transducer that uses NPN bipolar tran- 
sistors. In this circuit, a dual transistor 
(two NPN silicon transistors in a single 
case) such as a MAT-01 (made by Pre- 
cision Monolkhics, Inc.) is used. The 
emitters are fed from I- and 2-mA con- 
stant-current sources (it is important to 
keep the emitter currents different for 
Ql and Q2) and the output voltage is 
approximately 59 piV/°K. 

A differential op-amp is needed to 
amplify and scale the output voltage to 
a usable level. It is particularly con- 
venient to scale the voltage to 10 
m V/°K so that a simple voltmeter can be 
used. To do that for this transducer, the 
differential op-amp must have a gain of 
167. When the output voltage is 10 
mV/°K, any 3Vi-digit DVM can be used 
to measure temperature. 

A solid-state thermometer 

The electronic thermometer project 
shown in Fig. 5 uses a simple op-amp 
inverting follower circuit and a single — 
common — transistor such as a metal- 
case 2N2222. The transistor is used as a 
temperature probe and needs a suitable 
enclosure such as an old voltmeter 
probe grip, a short piece of metal tubing, 
etc. If the circuit is used to measure the 
temperature inside some piece of equip- 
ment, it can be mounted permanently 
and does not need a separate enclosure. 
v> However used, thermal contact with 
y what is being measured is important. In 
o the case of small-diameter metal tubing. 
EE the transistor case should be press-fit 
fu inside the tubing to insure that heat is 
jtJ conducted to the transistor's base-col- 
6 lector junction. If the fit is loose, or the 
g enclosure not metal, you should use 
oc silicone "heat transfer" grease for the 



best results. 

Two DC reference voltages are need- 
ed: plus and minus 6.2 volts. Diode Dl 
provides the positive 6.2-volts DC 
reference, while diode D2 provides the 
negative 6.2-volt DC reference. The 
+6.2 source is connected to the collec- 
tor-base terminal of the temperature 
sensor (Ql). That means that the emitter 
current of transistor Q I will be propor- 
tional only to the temperature (the col- 
lector voltage is constant). That current 
is amplified by an operational amplifier 
{IC I ) and scaled to produce an output 
potential of 100 mV/°K, Potentiometer 
R 1 is adjusted during calibration to pro- 
vide the proper scale factor. 

Again, an ordinary 3^-digil DVM can 
be used to measure temperature, but 
the reading will be in degrees Kelvin. 
To convert the reading to degrees 
Celsius, it is important to note that the 
Kelvin and Celsius scales are the 
same, but offset by 273 degrees (0° C = 
273° K). To read temperature in de- 
grees Celsius, an offset adjustment is 
needed. 

Potentiometer R3 converts the tem- 
perature range of the basic circuit from 
Kelvin to Celsius by summing a coun- 
tercurrent from the —6.2-volt DC supply 
with the current from the transistor. The 
potentiometer is adjusted to produce 
zero output from amplifier IC I when the 
temperature is exactly 0° C. 

Calibration 

Once the circuit is built it will have to 
be calibrated. Set Rl and R3 to about 
the middle of their respective ranges. 
Turn the circuit on, and wait about 10 
minutes for things to stabilize at room 
temperature. While you're waiting, pre- 
pare an "ice-point bath." The ice-point 
of water is 0° C; (the temperature where 
ice and water can exist in the same 
container). Use a regular thermometer 
to verify that the temperature is 0° C (or 
32° F), When the circuit has stabilized 
and the bath is ready, put the transistor 
into the water and wait about 30 sec- 
onds. When the output voltage of the 
operational amplifier has stopped 



I 



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2 mA 
CONSTANT- 
CURRENT 
SOURCE 



v f _ ll souhce jr 

TEST ^9 
POINTS FOR 

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CONSTANT-CURRENT 
SOUHCE 



I I 

MAT. 01 



FIG. 4— WHEN THE OUTPUT VOLTAGE Of this 
circuit is scaled by a differential op-amp, an ordi- 
nary DVM can be used to read trie temperature. 

changing, adjust potentiometer R3 for 
0.00 volts output. Let the transistor stay 
in the bath for a few more minutes, while 
monitoring the bath's temperature with 
a thermometer (not the one you're cali- 
brating) to make sure that it doesn't 
change. When you are satisfied that the 
output voltage is reasonably stable 
(some drift will occur), remove the 
transistor from the bath and allow it 
and the thermometer to come to room 
temperature. 

Once both have reached room tem- 
perature (indicated by the fact that both 
the thermometer's reading and the cir- 
cuit's output voltage no longer change), 
the last step in calibrating the circuit can 
be done. Adjust potentiometer R3 so 
that the reading on the DVM is the same 
as the reading on the mercury ther- 
mometer (ignoring the decimal point and 
trailing zeros on the DVM), When this is 

PARTS LIST— FIG. 5 

Resistors V« watt, 1% unless otherwise 
noted 

R1 — 100. 000 ohms, potentiometer 

R2— 100.000 ohms 

R3— 20,000 ohms, potentiometer 

H4 — 2200 ohms 

R5, R6— 10.000 ohms. 5% 

Semiconductors 

D1 . D2— LM1 13 (National) 6.2-volt Zener 

voltage- refers nee diode or equivalent 
Ql— 2N2222 or equivalent, metal case 
IC1— CA3140 MOSFET op-amp or 

equivalent 







FIG. 5— THIS ELECTRONIC THERMOMETER PROJECT Is easy to build and align. A parts list is 
included in this article for those of you that would like to try it 



58 




-5VDC 

FIG. 6— THE HEART of this temperature-to-frequeney converter circuit is a Date) VFQ-1 current-to- 
frequency converter iC. The 2N2907 is used as the temperature probe. 



done, a 0- volts DC output will equal OP C, 
a 3.00-volts DC output will equal 30° C, 
and so on. This happens, of course, be- 
cause of the 100 rnV/°C scaling factor. 
Alternately, a warm-water bath can be 
used for this part of the calibration pro- 
cedure. Prepare the warm- water bath 
by mixing hot and cold water, and 
follow the steps that were outlined 
above for calibrating the thermometer 
circuit at room temperature. 

The precision, and amount of drift, of 
this electronic thermometer depend on 
the quality of components used. The re- 
sistors, except for possibly R5 and R6, 
should be \% precision-types with a low 
temperature-coefficient of resistance. 
The Zener diodes should be tempera- 
ture-compensated reference types, such 
as National Semiconductor LMiD's. 
The op-amp should also be a low-drift 
type, although acceptable performance 
can be obtained with an RCA CA3 140, 
especially if it is heat-sinked. An ordi- 
nary TO-5 heatsink (the kind made of 
thin metal) will work nicely. 

Other devices 

There are a number of IC voltage-to- 
frequency (or current -to- frequency) 
converters on the market. An example 
of an IC that does both is the Date! 



FAHRENHEIT, KELVIN, CELSIUS 
AND CENTIGRADE 

There are three scales in common 
use for measuring temperature: 
Fahrenheit, Celsius (centigrade] and 
Kelvin, 

The Fahrenheit scale, now used only 
in the United States and a few other 
English-speaking countries, is based 
on the freezing and boiling points of 
water at sea level— 32" and 21 2°, re- 
spectively. The zero-point on this scale 
was probably established by using a 
mixture of ice and salt — materials com- 
monly used to achieve low tempera- 
tures in laboratories at the time the 
scale was developed. 

The Celsius scale, also known as the 
centigrade scale (it's not capitalized 
because, while the other three scales 
bear the names of their inventors — 
Gabriel Daniel Fahrenheit, Anders Cel- 
cius and Lord Kelvin — the term "centi- 
grade" refers to the fact that the scale 
is divided into a hundred divisions), is 
used outside the U.S., wherever the 
metric system is found. On it, the freez- 
ing point of water is 0" and the boiling 
point 100°. 

The Kelvin scale is also known as the 
absolute scale because its zero point 
is absolute zero, (-273.16° C or 
-459.69° F). the point at which all 
molecular motion ceases and there 
is — literally— no temperature. 

One degree in the Kelvin scale is the 
same size as one degree in the Celsius 
scale: therefore water freezes at 
273.16° K and boils at 373.16° K. The 
Kelvin scale is used primarily in appli- 
cations such as solid-state physics 
and astronomy. 

Incidentally, conversion from Fah- 
renheit to Celsius, and vice versa, is 
easier than you may think. To convert 
from degrees F to degrees C, just sub- 
tract 32 from the Fahrenheit tempera- 
ture and divide the result by 1.8. Going 
from Celsius to Fahrenheit is even 
easier — double the temperature, sub- 
tract 10%. and add 32. 



«REF 

5.00 voc 






)IC1 
AD 590 



R1 
9501} 



RZ 
1QQSJ 



>1mvnc 



FIG. 7— A TEMPERATURE-SENSITIVE current 
source, the AO590, Is used to measure tempera- 
ture in this simple circuit. 



VFQ-1 . That IC is shown in a tempera- 
ture-to-frequency converter circuit in 
Fig. 6. In the circuit, we are using the 
VFQ-1 as a current- to-frequency con- 
verter; the current is supplied by the 
collector of a PNP transistor that is used 
as a temperature transducer. 

This circuit's output frequency will 
have a scaling factor of 10 Hz/°K. We 
can, therefore, expect an output fre- 
quency of 2730 Hz at the freezing point 
of water (273° K, or 0° C), and a fre- 
quency of 3730 Hz at the boiling point of 
water (373° K or 100° C). This type of 
circuit can be used to record the tem- 
perature data from an experiment on 
magnetic tape, or to transmit the tem- 
perature via radio telemetry from an 
amateur rocket or model aircraft. Un- 
fortunately, the Date I IC is still a little 
expensive (although it is one of the low- 
est cost converters on the market) and is 
not generally available through hobbyist 
outlets. 

Another special temperature-mea- 
surement semiconductor device is the 
AD590 (Analog Devices, Inc.) It is a 
two-terminal IC that is available at iow 
cost in either a TO- 18 case or a special 
two-terminal flat-pack. The device is a 
temperature-sensitive current source 
and is scaled to approximately I ^A/°K. 
If we pass the current from the AD590 
through a 1000-ohm resistor, the result 
(using Ohm's law) is a voltage change of 
I mV/°K. 

There are several ways that we can 
use the AD590 device. One is simply to 
connect it as shown in Fig. 7, in series 
with approximatley 100 ohms of resis- 
tance. This configuration is called a one- 
temperature, or one-point, circuit. We 
adjust potentiometer R2 so that the out- 
put voltage agrees with a mercury ther- 
mometer at some specific temperature. 
Slight nonlinearities in the device, as in 
all semiconductor devices, will cause 
some error at points far removed from 
the calibration point. 

Another method is to connect the 
AD590 directly between a +5.00-volt 
DC precision reference source and the 
inverting input of an op-amp. The scale 
factor of the thermometer can be set by 
the feedback resistor (R F ) using the 
formula: V = (1 n A/°K) (R F ) (T), 

We can also use the AD590 in a two 
trim-point circuit that uses an op-amp as 
described above. An offset current is 
summed with the AD590 current at the 
inverting input of the op-amp. We can 
then use two potentiometers, one for 
offset and one for gain, to adjust the 
circuit at two different temperatures, 
thereby reducing the error. 

Electronic thermometer projects are 
easy to build and calibrate, and they 
can be put together by anyone who 
knows Ohm's law and the basic princi- 
ples of op-amp circuits. Just remem- 
ber to use precision components that 
don't drift with — you guessed it — 
temperature! R-E 



59 



I 



/^LM^MT 



: 




IN lUf.si 1 1 1 c . I r 1 E t ll\"l <KA [IMF S. IT'S 

rather surprising that no one has mar- 
keted an updated version of the old- 
fashioned player piano. That is. of 
course, until recently. Superscope has 
developed an all-electronic version, the 
ocorder Reproducing System, for 
Mararttz pianos. The Pianocorder is 
also available as a kit (model P-IOI)) that 
can be installed in your own piano. That 
kit is the subject of this article. 

Before we go any farther, let's see just 
what the Pianocorder is. and how it dif- 
fers from the air-operated units of many 
years ago. Old-fashioned player pianos 
used paper rolls about the size of kit- 
chen waxed-paper rolls with music '"re- 
corded" on them: the recording took the 
Form of holes and slots in the paper. 
Among the problems with that system 
was that those rolls were rather fragile 
and difficult to store. 

Contrast that with the Pianocorder 
system that uses ordinary audio cassette 
tapes. While you can purchase prere- 
corded tapes for the Pianocorder sys- 
tem, you can also record your own 
piano music. At this point you may be 
thinking: "'So what, my cassette re- 
corder can do that already." There is a 
very important difference, though: The 
Pianocorder does not record the music 
itself, but. rather, the individual piano- 
key strokes. The music you hear does 
not come from a speaker: it comes From 
the piano itself. For the dyed-in-the- 
wool hi-fi purist, you can't get more 
faithful reproduction from any other 
music system! 

How it works 

The system uses eighty solenoids 
with push rods attached to the upper 
parts of their moveable cores. (The top 
and bottom 4 keys of the standard 88- 
key piano keyboard are not used. Many 
old-fashioned player pianos had only 80 
keys and since those extra 8 keys are 
seldom used, no provision is made for 
them.) The solenoids are positioned so 
that each of the push rods extends 
through slots in the key bed and comes in 
contact with the underside of one of the 
keys. Because each piano key is actually 
a lever with a fulcrum at its center, when 
you press a key down, its other end 
moves up. When the solenoid for any 
key is energized, its core moves up- 
ward, moving the push rod at the same 
time. The effect of the push rod's strik- 
ing the bottom of a key is the same as 
your striking the top of the key at the 
keyboard . 

A rail with SO very sensitive switches 
mounted on a Ft' board is used when 
recording music: the rail is installed 
under the front part of the piano keys 
as shown in Fig. 1. When the rail is 



to 



o 

Q 



Superscope s 




What ever happened to the old-fashioned player piano? 
It's back, with an electronic facelift — a facelift 
you can perform yourself. 



WARREN BAKER 

properly installed and adjusted, one 
switch is located directly under each 
key. If a key is struck, the switch un- 
der it is closed. The switch closure lets 
the system know which key has been 
struck, and that information is recorded 
on tape. Switches attached to the "sus- 
tain" and 'soft" foot petals work in a 
similar fashion, and the information 
from them is also recorded by the play- 
er ptano. 

Of course, there's more to a piece of 
piano music than just striking the keys in 
a particular sequence. The player's "ex- 
pression" (how softly he strikes the 
keys, for example) is also taken into ac- 
count. A small microphone mounted on 
the "record" board picks up the relative 
acoustic pressure in the lower part of the 
piano and converts it to a signal that, 
when the recording is played back, 
helps the Pianocorder reproduce the 
piece of music faithfully. That feature 
often makes it difficult to tell a recording 
from the original rendition. 

The electronics used in this recording 
system are quite exotic when compared 
to those found in most other consumer 
items. Even though a microprocessor is 
not used by this player piano, in many 
w'ays the system can be compared to a 
dedicated computer. 

Logic and encoding 

The system uses sixteen 8-bit words 
to encode each note (or chord), and to 
indicate the intensity with which each 
kev is struck and the use of the foot 



pedals. Timing is derived from a master 
clock. Figure 2 shows how the bits are 
assigned in the encoding scheme. 

In examining the system, perhaps the 
best place to start is word 15. the 
"sync" word. That is the last in the 
sequence and can best be compared to 
the sync pulse of a composite TV signal 
since it establishes the proper relation- 
ships for all of the other words. Word 15 
consists of 6 lows, I high, and I low 
(OtHWJWfl): if there is a malfunction and 
any other bit sequence appears for word 
15. the system will not work. 

Two bits of word zero (the first word 
in the sequencel are used for the foot 
pedals. Five of the remaining six bits of 
that word are used for bass intensity 
(more on that later): the leftover bit (bit 
two) is not assigned. The notes are 
handled by words 2 through 6. and 9 
through 13: each bit represents one 
of the 80 notes ( 10 words of 8 bits each 
give 80 notes). 

As pointed out earlier, expression is 
an important variable in the recording 




FIG. 1— HIGHLY SENSITIVE SWITCHES mount- 
ed under each key are used to record your own 
performances. 




system. The signal from the microphone 
on the "record" board is applied to the 
bass and treble registers' active filters, 
and then to a digital-to-analog converter 
(DAC) for inclusion into the respective 
bass or treble counters and registers. On 
playback, the process is reversed, and 
the information used to "modulate" the 
action of the solenoids. Bass intensity is 
handled by 5 bits of word 0: treble in- 
tensity is handled by 5 bits of word 8. 
The inclusion of the intensity informa- 
tion helps to combine the Pianocorder 
and the piano into a system that, accord- 
ing to the manual, "...truly reflects the 
touch of the pianist." 

The digital information generated by 
the logic as just outlined is first fed to a 
parallel-to-serial converter, and from 
there goes to a bi-phase converter that 
generates tones which can be recorded 
on tape. A 2250-Hz tone is used to repre- 
sent a logic-0 and a 4500-Hz tone a logic- 
t. That principle is similar to that used 
by home computers for storing data on 
cassette tape and. in fact, both tapes 
sound similar when you play them back 
on an ordinary cassette recorder. 

During playback, the signal from the 



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FIG. 2— BIT-ASSIGNMENT used by the Piano- 
corder's encoding system. Each key or pedal 
depression results In a 128-bit string. 



recorder is fed to the playback logic- 
board (shown in Fig. 3) through an opto- 
isolator that segregates the cassette re- 
corder's circuitry from the 5-volt cir- 
cuitry used by the balance of the sys- 
tem. The audio signals are routed to the 
board's decoders and counters, and the 
resulting logic-level control voltage goes 
to the appropriate solenoid -driver board 
(see Fig. 7). The (70-volts required to 
drive the solenoids is switched by power 
transistors that are located on the 
driver boards. 

To reduce heat build-up. a special cir- 
cuit allows full current-flow to the sol- 
enoids only when they are ftrst ener- 
gized. The current is then reduced to a 
level just sufficient to hold the sole- 
noids" slugs in position, and held at that 
point until the solenoid is de-energized. 

Power supply 

The power supply is quite straight- 
forward and provides the three DC volt- 
ages (+5. + 12. and + 170 volts) that are 
required by the system. Power for the 
solenoids is derived from a bridge 
rectifier. An interlock switch mounted 
on the playback logic -board prevents 
the solenoids from being activated if the 
front of the piano is removed. That fea- 
ture is included for safety. 

The 5- and l2-vo!t supplies are taken 
from a step-down transformer. The 5- 
volt supply uses a 723 regulator. It 
should be noted that the system uses 
three separate ground connections. One 
of those, the system ground, ties to- 
gether all of the metal parts of the Piano- 
corder and the piano, and connects 
them to the power-line neutral (the 
"green" prong of the three-prong pow- 
er-line plug). That can cause some prob- 
lems when troubleshooting or testing 
the Pianocorder if you use an oscillo- 
scope (or other piece of test equipment) 
that is grounded to the power-line neu- 
tral. The instructions suggest that you 
use battery-operated test equipment or 
an isolation transformer when testing 
or servicing the system. Otherwise, 
your common-ground connection should 
be chosen with great care. 

Before you begin 

Needless to say. installing the Piano- 
confer in your piano should be done 
with care. Superscope has made several 
assumptions about your knowledge and 
equipment. It is assumed that you have 
a well-equipped shop with all the usual 
hand and power tools, and that you 
know how to use them. Some of the 
tools used by piano technicians would 
also be handy to have but it really does 
not pay to buy them for a one-time 
project such as this. You can do very 
well without them, although the job may 
prove to be a little more difficult. There 



are also certain parts of the project 
where a "helper" will make things a 
great deaf easier: perhaps a family 
member can be pressed into service in 
those instances. 

Superscope also assumes that you 
have a "fair" working knowledge of 
how pianos operate. Don't let that scare 
you. though, because the installation 
manual covers all the working parts of 
the typical piano, in great detail. In gen- 
eral, the instructions are extremely 
elaborate. There are warnings through- 
out the instructions (where needed) that 
urge the installer to be absolutely certain 
that he understands the step being de- 
scribed before carrying it out. Be sure 
to heed those warnings! 

Before beginning the installation, 
some measurements have to be made to 
determine whether or not you will be 
able to install the Pianocorder in your 
piano; those measurements are com- 
pletely explained in the instruction man- 
ual. Although a number of measure- 
ments are required, only a few have any 
serious bearing on the end result, even 
though some may seem to indicate that 
you will not be able to install the unit. In 
some cases further instructions show 
you how to overcome the problem, 
while in other cases, (depending upon 
your abilities as a technician) you may 
be able to find your own way out of 
dilemma. 




FIG. 3— MOST OF THE ELECTRONICS are In- 
stall id In the lower part of the piano. Shown here 
are the solenoids, three of the five solenoid- 
driver boards, the playback-logic board, and the 
power supply. 







z 
O 
< 



FIG. 4— DURING PLAYBACK, the piano keys are 3> 

operated by the solenoids which, in turn, are -$ 

controlled by the appropriate driver boards. The _. 

solenoids at the far left operate the "soft" and Sg 

sustain" foot pedals. -* 

61 




FIG, 5— THREE Vi-INCH SLOTS (one shown 
here) had to be cut into the keybed so that push 
rods connected to solenoids mounted on the 
underside keybed could operate the keys. 
Seven keys were removed here to show detail. 

Modifying your piano 

The modifications that have to be 
made td the piano will vary with the I ype 
of piano you own. In my case, probably 
the biggest one was cutting three Vi- 
i itch- wide slots through the keyhed; 
those slots let the solenoids that are in- 
stalled on the underside of the piano 
operate the keys (see Fig. 5). In addi- 
tion. I had to modify the mounting 
bracket that connected the "harp" 
frame to the keybed. (I cut it down. )The 
pedal "trap" mechanism also had to be 
remounted to provide clearance for the 
pedal solenoids. Although that was eas- 
ily done for my piano, the same may not 
be true for other units. The instructions 
for this pan of the project leave the de- 
tails entirely up to you and plainly state 
that the examples provided are only 
representative of some of the methods 
that can be used. 

Installation 

It is important that the solenoid push- 
rods contact the underside of each key 





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FIG. 6— THE PIANOCORDERS cassette tape 
recorder looks much like a regular one. The 
master ON /off switch is at the left. 

a\ cleanly ;i-. possible. A locating 
""stick" has to be prepared, and is used 
to determine ihose contact points: it 
must be marked accurately. The posi- 
tions determined by the stick are used to 
place the solenoids in their proper posi- 
OT tions on the solenoid rait. If you are 
9 sloppy when you position (he solenoids. 
O you may have the nasty and time-con- 
j£ suming problem of making individual 
v adjustments after the assembly has been 
q] installed in the piano. (In my case, one 
o solenoid was misadjusted: that error 
q caused two of the keys to sound at the 
a: same time.) 



Since the Pianocorder uses cassette 
tape, it also needs a cassette recorder/ 
player. That unit, shown in Fig. 6. looks 
like a ruggedized version of a standard 
portable one. it runs at a speed of 394 
inehes-per-second. In use. the recorder/ 
player swivels out from tinder the right- 
hand side of the keyboard. The master 
ON/OFF switch and other operator con- 
trols are also located on the recorder 
assembly. Some pianos (mine included) 
may have a slight rim at the front of the 
cabinet, in the area where the recorder 
is to be mounted. The modification 
needed in that case is simple: A half- 
inch spacer is used to give the recorder 
enough room to clear the rim. 

Since, for some reason, someone had 
previously modified the piano I used for 
this project, some of the situations I ran 
into should not be considered typical. 
For instance, it appeared that sometime 
in the past the entire keyboard (and key- 




FIG. 7— ADDING A HALF-INCH block ot wood to 
the bonom of each key made it possible to install 
the P/anocorder in my piano. The lower key is 
shown unmodified. 

bed) had been raised a full inch above 
their normal position. Since the sole- 
noid push-rods could not reach the un- 
derside of the keys because of that in- 
creased elevation, it at first appeared 
impossible to install the Pianocorder. 
Fortunately. I was able to solve that 
problem with a little ingenuity. Gluing 
half-inch-thick pieces of wood to the un- 
derside of each key (see Fig. 7) made 
up for the increased height and, when 
the project was completed, the player 
piano worked perfectly. 

It is interesting 10 note that the above 
modification also could have saved me 
considerable work in cutting the mount- 
ing bracket. As mentioned earlier, I had 
shortened the bracket so the solenoid 
rail could be placed closer to the key- 



bed and allow the push rods a longer 
throw: the added pieces on the keys 
served the same purpose. 

From the point where the solenoid rail 
i*> installed in the piano, the work con- 
sists mostly of drilling pilot holes for the 
screws used to mount the various parts 
of the Pianocorder. Surprisingly, how- 
ever, most of the system's components 
are connected to each other, and very 
little is actually attached to the piano. In 
fact, only the power supply and the 
playback logic-board (with the piggy- 
back-mounted "expression" board) are 
actually secured to it. With the excep- 
11011 of installing the record key- 
switches (more on those later), all the 
work is done in the lower section of the 
instrument. 

The instructions are phrased for use 
by piano technicians who, in all proba- 
bility, are not too familiar with the elec- 
tronic pails of the reproducing system. 
Because of that, it may seem to some 
readers that the instructions have been 
too simply written at times. Bear with 
them, however: they will lead you 
through the project, and help insure that 
the piano will produce wonderful music 
when you're finished. 

As you may have guessed by now, 
installing the Pianocorder in your piano 
is not a one -night project. However, if 
you decide to undertake the job. the 
time you spend will be justified by the 
entertainment this system can provide. 
The completed player piano will amaze 
your friends and neighbors, and provide 
untold hours of family fun. There are 
tapes available that cover just about 
every musical taste or period and in ad- 
dition, you will have the pleasure of 
being able to record your own per- 
formances for posterity ! 

Installing the Pianocorder in my 
piano has been one of the most enjoy- 
able construction experiences that I've 
had in a long time. Coming from an elec- 
tronics "builder," that statement means 
quite a bit. In closing, it should be reiter- 
ated that this kit is not something for 
an inexperienced person to undertake 
without some help from someone with a 
good knowledge of tools and their prop- 
er use. Yet, if you use good common 
sense and follow the instructions, you 
should be able to complete this satisfy- 
ing project. R-E 



431 





62 



MODEL 220 



MOST OF THK NOISE-REDUCTION SYSTEMS 
used in high-fidelity circles during ihe 
fast few years have been geared primar- 
ily to tape recording and playback. For 
example, Dolby noise reduction, while 
sometimes used by FM stations to in- 
crease their noise-free coverage area or 
to improve the dynamic range of their 
musical programs, is confined mostly 
to tape-recording ap- 
plications. Specifi- 
cally. Dnthy B noise- 
reduction encoding 
and decoding has 
found its widest ap- 
plication in stereo 
cassette-tape decks. 

To date, the only 
companding type of 
noise-reduction sys- 
tem that has been ap- 
plied to phonograph 
records has been the 
one developed by 
dbx. Inc. In that sys- 
tem, program mate- 
ria! is first compressed 
by a ratio of 2:1 for 
cutting the master 
disc, and then ex- 
panded by a ratio of 
1 :2 during playback 
of records manufac- 
tured from that mas- 
ter. While the system 
is startlingly effec- 
tive, both in terms of 
noise reduction and 
in terms of increased 
dynamic range capa- 
bility, a dbx decoder is required to play 
the discs. If they are played back with- 
out the decoder, they sound — to say 
the least — strange. 

Now, CBS has come up with a new 
companding system for discs, designated 
CX, that is said to offer several ad- 
vantages over any earlier one. Among 
them are: 

1. Compatibility — encoded record- 
ings can be listened to with or 
without a decoder. 

2. A 20-dB reduction in perceived 
surface-noise. 

Excellent transient response. 
Little or no audible pumping 
(audible variations in the volume 
of the background noise due to 
the action of the filters) or switch- 
ing of noise in the companded 
state. 

5. Relatively independent signal 
Sevels. 

To get the most out of the system a 
decoder costing about SI 00 is required, 
but what sets the CX system apart 
from the others is that a CX-ertcoded 
record can be played on ordinary equip- 



ment without the decoder and still 
sound good. With most musical selec- 
tions, the undecoded record is com- 
parable in sound quality to a conven- 
tional record containing the same pro- 
gram material. Of course, with no ex- 
pansion during playback, there is no 
noise reduction. With the decoder, the 
quality is nearly indistinguishable from 



CX Noise Reduction 
for Phono Records 



will reduce this to about SI dB. That is 
still about 20 dB better than the 60-dB 
dynamic range available on the best 
modem vinyl records. Hence, by 
choosing a 20 dB companding system, 
and adding the 20 dB of dynamic range ; 
the "bottom," CBS has. in effect, per- 
mitted today's vinyl records to equal 
multi-channel digital tape -recordings as 
far as dynamic range 
and quietness are 
concerned. Sounds 
that were previously 
masked by record 
surface-noise can now 
be heard clear! v. 




phAse linear 



CBS En* DECODER 



(quke m erp«ss 



A new noise-reduction system for records from CBS 

provides 20 dB of noise reduction, yet discs made 

using it suffer no loss in quality when played without 

a decoder. 



LEN FELDMAN 

CONTRIBUTING EDITOR 



the original master tape, 
or digital. 



whether analog 



3. 

4. 



Why stop at 20 dB? 

The CX system works by adding 20 
dB to the dynamic range of a recording. 
This expansion is added at the "quiet" 
end of the range — the area where 
record surface-noise begins to present 
problems. 

The reason CBS settled for just 20 dB 
is interesting. The new system is ob- 
viously designed to serve as a stop-gap 
measure until true digital phonograph- 
records become available. (The records 
that are called "digital" today are 
simply analog discs that have been 
mastered from digital-audio tapes.) 
Now that tape hiss is no longer a limit- 
ing factor in mass-produced phonograph 
records (thanks to digital master-tapes) 
the new limiting factor becomes the 
surface noise of the disc itself. A pro- 
fessional-type digital tape recorder has 
a maximum effective dynamic range of 
about 95 dB per channel. After a 24- 
track mix-down, it can be shown that 
the randomly added noise introduced 



Wide-band 

companding 

Record-surface 
noise has a frequency 
spectrum similar to 
that shown by the 
broken line in Fig. I: 
it is relatively strong 
at bass and treble fre- 
quencies. However, 
sensitivity of the 
human ear decreases 
at low and high fre- 
quencies, as is shown 
by the constant loud- 
ness-contour curve 
(the solid-line) in that 
figure. If the value of 
the constant loud- 
ness-contour curve is 
subtracted from that 
of the record surface- 
noise curve, it can be 
seen that the perceived noise is nearly 
flat as a function of frequency. From 
that. CBS concluded that noise reduc- 
tion should be uniform at all frequencies. 
That differs from the approach used by 
Dolby for tape and FM broadcasting, 
fargely because the noise spectra for 
those media are not the same as the sur- 
face-noise spectrum of a phonograph 
record. 

The wide-band compression/expan- 
sion function shown in Fig. 2 was 
chosen by CBS for its system. The 
compression curve has a 2: 1 gain for 
signals from above dB reference 
level (5 cm/second lateral stylus-velocity 
at I000 Hz) down to 40 dB. Since 
compression below -40 dB is not de- 
sirable because it would tend to raise 
the level of the background noise of the 
master tape above that of the surface 
noise of the record, the compression 
slope is rapidiv changed to I: I below 
-40 dB. 

If digital tape is used as the mastering 
source for a record, the perceived sig- 
nal-to-noise ratio is reduced by the 20- 
dB compression, making it roughly 



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-L- RECORD NOISE- 1 

j[||[l 1/3 OCTAVE BAND SPECTRUM 






JTjT 


-A WEIGHTING (APPROXIMATE 
30-PHON LOUDNESS CONTOUR) 


V 




1 


















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1 






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1 








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20 100 200 IK 2K 

FREQUENCY-H* 



10K 20 
K 



RG. 1— WHILE RECORD SURFACE-NOISE Is 
greater at bass and treble frequencies, the sen- 
sitivity of the human ear Is reduced In those 
ranges. The overall subjective response Is 
essentially flat. 



INPUT -dB 
-80 -80 -40 -20 



1 




s^yf 


COMPRESSION 




/ / 




\ 




f / 






/ 








/ 








/ 






/ 








/ 








/ 














/ 


A 






/ 


/ 


"— EXPANSION 


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-40 = 



-60 



FIG. 3— COMPRESSION AND EXPANSION 
curves for the CBS noise-reduction system. 
The curves are complementary so that a pro- 
cessed signal will closely match the original 
program source. 

equal to that of a conventional (unen- 
codedl record. If an encoded record is 
played back without the benefit of a 
corresponding expansion circuit, 
changes in the dynamic gain of the 
master tape's noise tend to be masked 
by the continuous record-surface noise, 
making them all but inaudible to the 
listener. That effect is aided by care- 
fully choosing the time constants that 
are used in the control circuitry of the 
system (more on that later). 

Figure 2 also shows the expansion 
curve of the system. That curve is com- 
plementary to the compression curve 
so that a signal that undergoes the en- 
tire process of compression and expan- 
sion will match the original program 
source closely, but with 20-dB less 
noise. For proper operation, the system 
requires reasonably accurate tracking 
by the phono stylus. Not ail phono 
cartridges deliver exactly the same 
level of output for a given stylus velocity 
in a record groove and for that reason it 
is possible for the reproduced signal to 
differ somewhat from the source 
material. 

According to CBS, however, that ef- 
fect has been found to be virtually un- 
noticeable for mismatches of up to 6 dB 
between the expansion and compres- 
sion curves. Some of the CX expanders 
on the market offer a calibration adjust- 
ment so they can be used with virtually 
any stereo cartridge. 



Expander 

A block diagram of the CX expander 
is shown in Fig. 3; a representative 
schematic is shown in Fig. 4. Left- and 
right-channel signals from a OY-en- 
coded record are fed directly to their re- 
spective variable-gain amplifiers. At 
the same time, those signals are pro- 
cessed by a control circuit whose out- 
put is the control voltage for the variable 
amplifiers. The control circuit consists 
of three distinct sections: a rectifier cir- 
cuit with a preset threshold-voltage, a 
filter circuit, and a time-constant circuit. 

Rectifier circuit 

In the rectifier circuit, the combined 
left- and right-channel inputs are full- 
wave rectified before being passed on 
to a maximum-signal selection output. 
For signal values above the present 
threshold. V c , the control circuit's out- 
put varies in direct proportion to the 
input-signal level. These changes con- 
trol the amplification factor of the 
variable-gain stage. Together with the 
changing signal-levels at the variable- 
gain stage, the combined effect is an 
output that increases or decreases at a 
2: 1 ratio with respect to the input, when 
the level of that input is above V c . 

When the signal level falls below V c , 
the control circuit's output no longer 
changes. Under those circumstances 
no expansion takes place between the 
input and output. 

Filter circuit 

The main filter-circuit (IC2-a, D6. 
R 10. Rl I . and C3 in Fig. 4) is relatively 
fast, with an attack time-constant of 
about one millisecond and a release 
time-constant of about 10 milliseconds. 
Those time constants allow for rapid 



action of the control signal. 

If the output of the main filter-circuit 
were used by itself as a control signal, 
the results would be unacceptable be- 
cause noise, distortion, and pumping 
would occur. To avoid those effects, 
the multi-filter, multi-time-constant, 
circuit shown in Fig, 3 is used. 

Multi filter/time-constant circuit 

This circuit consists of four filters 
whose outputs are added together to 
form a single control-signal. Filter 1 is 
high -pass filter with a "dead band" (the 
filter ignores signals below a certain 
level) and a positive-peak rectifier; the 
filter has a time constant, T| , equal to 
30 milliseconds. Filter 2 is a low-pass 
type with a time constant, T 2 , of 2 
seconds. Filter 3 is a low-pass type, 
with a dead-band and a positive-peak 
rectifier; that filter's time constant, T 3 , 
is 30 milliseconds. Finally, filter 4 is 
another low-pass type, with a dead 
band and a negative-peak rectifier; it 
has a time constant, T 4 , of 200 milli- 
seconds. 

Filter operation 

Filter 2 is used to insure minimum 
audible noise and signal modulation in 
steady, low-level, signals. If it were 
used alone, it would suffice for that 
purpose but would not respond ade- 
quately to rapid changes in musical 
content. That is the function of the re- 
maining filters. 

Filters 3 and I are used for musical- 
transient signals of short or medium 
duration. Filter 3 allows a fast attack to 
pass, and then begins its 30-millisecond 
decay. Even with good filtering ahead 
of this stage, its DC input will contain 
some ripple. If the ripple component is 




VARIABLE 
GAIN (LEFT) 



LEFT 
OUTPUT 



TIME-CONSTANT CIRCUIT 
^ * 



,- — 



FILTER 
Tl 



*-* 



RIGHT 

INPUT 




RECTIFIER 
CIRCUIT 



MAIN 
-H FILTER 
CIRCUIT 



V C (DCREF£HENCE) 



FILTER 
T2 



FILTER 
T 3 



_ FILTER 
T 4 




VARIABLE 
GAIN (RIGHT) 



SUMMING 
NETWORK 

*. RIGHT 
OUTPUT 



FIG. 3 — BLOCK DIAGRAM of a CX expander unit. The Input signal is fed to both variable-gain am- 
plifiers and to a control circuit. The output of the control circuit (which consists of rectifier, main- 
filter, and time-constant circuits) is the control currant for the variable amplifiers. 



LEFT 

OUTPUT 




FIG. 4 — THE OUTPUT of the time-constant circuit is buffered by IC2-c, and then summed by IC2-d and 
Q4, a voltaga-to-current converter. The control current for the variable-gain amplifiers (IC3-a and 
IC3-b) Is taken from the collector of Q4. 



not removed, audible distortion wiU 
occur in the transient. Listening tests 
have confirmed that the human ear is 
not particularly sensitive to such dis- 
tortion if its duration is less than 30 
milliseconds. So filter 3 passes only the 
first 30 milliseconds of the attack- 
transient. If the signal continues for 
longer than 30 milliseconds, filter 1 
takes over. It is a low-pass filter with a 
30-miliisecond time constant. When a 
sudden transient signal occurs, that 
filter will ignore the signal for the first 
30 milliseconds, but will allow what 
comes after that length of time to pass. 
It will also remove nearly all of the 
ripple from such signals. 

Filter 4 is used to control sudden de- 
creases in signal levels. If such sudden 
decreases were not controlled, pumping 
or "breathing" would be heard. It's 
been demonstrated that the human ear 
is not sensitive to pumping during a 
rapid decay of not more than 200 milli- 
seconds. Filter 4 allows the circuit to 
track the decay for that length of time. 
After that period, at the time when the 
listener would begin to notice the decay, 
control is taken over by filter 2. That 
filter, thanks to its two-second time 
constant, keeps the noise-level relative- 
ly steady. 

According to CBS engineers, the 
overall combination of the four filters 
allows their system to operate effec- 
tively with music signals that would be 



considerably more difficult for other 
noise reduction or companding systems 
to handle. 

An obvious advantage of the system 
is the compatibility claimed for it. If the 
encoded version of a given piece of 
music is indeed virtually indistinguish- 
able from the conventional pressing of 
the same material, CBS Records, or 
anyone else using the CX system, will 
have to produce only one type of 
recording in the future. The casual 
music listener can then listen to that 
recording on his ordinary phonograph 
or hi-fi component-system as he nor- 
mally would. The more serious audio- 
phile. on the other hand, will be able to 
add a relatively inexpensive expander 
accessory to his stereo system and 
enjoy the full benefit of an additional 20 
dB of noise reduction. 

ft is interesting to note that CBS has 
proposed that its new companding sys- 
tem be incorporated in any multi-chan- 
nel TV -audio system that might be ap- 
proved by the FCC in the future. 
Transition to stereo audio (or multi- 
lingual audio), regardless of which of 
the proposed systems is chosen, is 
bound to result in some degradation of 
audio signal-to-noise ratios for many 
viewers within a TV station's service 
range. The incorporation of a compand- 
ing system at the outset would help to 
offset that degradation. Furthermore, 
since the CBS system is claimed to be 



compatible, those viewers who con- 
tinue to watch the future "stereo" TV 
programs over their mono TV receivers 
would not notice any difference in 
audio quality. Other noise reduction 
systems that have been suggested for 
TV stereo-audio include a modified, 
compatible form of the linear dbx com- 
panding system and the newly de- 
veloped Dolby C noise-reduction sys- 
tem (see the May issue of Radio-Elec- 
tronics) from Dolby Laboratories. R-E 







'Mmmmm — what smells so good?' 



65 



D< 



MWdL!^ 



run 




Part 3 



[N THIS PART WF.U FIN- 

ish up the Programma 
2. calibrate it, and put it to use. All the 
hard work is already done, so all that's 
left are a few easy things like stuffing 
the switch board, and putting the elec- 
tronics in a case. Let's get started by 
discussing the circuitry on the switch 
board before we put it together. 

Switch board theory 

Surprisingly enough, the switch board 
isn't absolutely necessary in this 
project! A three-position switch could 
be used in its place to select the proper 
VCO, serving as a "bandswitch." 
However that isn't a very elegant ap- 
proach to selecting ranges, and you'd 
have an extra switch to fiddle with. Top 
that off by realizing that the IC's cost 



at pin I of the IC goes low. Since those 
conditions also apply to a "9" input, 
gate IC304-a detects that condition via 
the "D" input, and prevents decoding 
of that value. Pin I of IC302-b drives in- 
verter IC304-C, which puts a logic 
"high" on gate 10303-b whenever a 
"3" or "4" switch input is decoded. 
That "high" passes through the gate, 
turning on transistor Q302. On the 
other hand, if any other number besides 
"3" Or "4" is applied to the decoder, it 
won't be decoded, and pin I of IC3fP-b 
will be high. That goes to gate IC303-a. 
and turns on transistor Q30I. That 
takes care of the decoding scheme for 
the i-MHz switch position. 



easy to get if you don't have them. That 
makes this phase of the project a good 
candidate for a Sunday afternoon 
when all the stores are closed. Refer to 
Fig. 15 for details as you stuff the board. 
Start by positioning the board as 
shown. Then begin by installing the 16- 
pin IC socket at IC30I, Position the 
notch indicating pin I pointing up. {Do 
that with the rest of the sockets, too.) 
Then install the three 14-pin sockets. 




GARY McCLELLAN 



In the concluding part of this article we'll 
finish building the Prog ram ma 2 synthesized RF 
generator, calibrate it, and present some hints on using it. 



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about the same as a decent switch, and 
you'll want to build the board. 

Basically, the switch board, whose 
schematic is shown in Fig. 13, is nothing 
but a decoder circuit. It plugs into JI01 
on the control board, and decodes the 
BCD signals from the io-mh? and i-mhi 
positions on the switches. The decoded 
signals then turn on one of three transis- 
tors on the VCO board, applying power 
to the correct VCO circuit. 

In operation, BCD data from the i- 
MH/ switch position is supplied to the 
switch board, and drives display de- 
coder IC301. Although the IC was de- 
signed to drive an LED display, it can 
decode in other ways. too. When binary- 
coded-decimal inputs of "3" or "4" are 
applied to the decoder, the "b" and "g" 
segment outputs are high, while the "e" 
segment is low. Gates IC302-a and -b 
detect those conditions, and the output 



Decoding the iq-mhz switch position 
is easier. Gate IC304-b detects a logic 
"high" on either the "A" or "B" in- 
puts. When that happens, as it would if 
the switch were set to "I." "2," or 
"3." the output of IC304 goes low. 
That shuts down gates IC303-a and -b 
making transistors Q301 or Q302 tum 
off. At the same time, the pin-4 output 
of IC304-b is inverted by IC304-d, 
turning on transistor Q303. Thus, the 
I0-to-30 MHz VCO is selected. 

The remaining components on the 
board are strictly for protection, and 
can save the IC's if the cable to the con- 
trol board is plugged in backwards. 

Switch board construction 

Assembling this board is easy, and the 
whole thing should take little time. The 
foil pattern is shown in Fig, 14. Note that 
all the parts are common, and should be 



Check to be sure you've soldered all 
connections. 

Continue with the resistors. Install six 
100K units at R30I through R306 as 
shown, near the left side of the board. 
Then install a I OK resistor at R307. 
Bend the leads as shown, and insert into 
the board. Below it, install another re- 
sistor at R308. Finish up by installing a 
10K unit at R309. Again, bend the leads 
as shown, and then insert them into the 
board. Note that "spaghetti" tubing 
over the leads is unnecessary. 

Note that the two jumpers run be- 
tween the ICs. Use leftover resistor 
leads for the jumpers, if you wish. In- 
stall the jumper that runs horizontally 
between IC301 and IC304. Bend the 
wire into shape first, and then insert it 
into the board. Pul! the wire tight against 
the board before soldering. After that, 
install the vertical jumper in the same 






manner. Be sure to pull it tightly against 
the board so that it can't touch the first 
jumper. 

Now for the transistors. Notj 
they are all 2N3904's. and lhat the; 
mount facing inline i 
Mount Q301 first, with the flat side in 
the case pointing up. Then mount Q302 
below it in the same manner. Finally, 
mount Q3Q3 near the bottom of the 
hoard, with the flat side pointing up. 

Install a IN4148 diode at D301 as 
shown, with the banded end pointing 
toward the center of the board. Then 
install a 0. 1 uF disc at C30I between the 
transistors. That takes care of the com- 
ponent installation on the board. 

Finish up with the cables, starting 
with the input cable— the one with the 
plug on it. Cut about a six-inch piece of 
8-conduclor ribbon cable, and prepare 
the ends. Then prepare the 8-pin DIP 
der PI. (01. Solder the wires to it in 
Bnd snap the cap in place. 
"Connect the other end of the cable to 
the board as shown in Fig. 15. (You may 
want to check out the connections with 
an ohmmeter.) Once the input cable has 
been installed, you can procede to the 
output cable. Cut about an eight-inch 
length of 3-conductor ribbon cable, and 
prepare the end. Install the wires in the 
holes near the transistors as shown in 
Fig. 16. You should make a note of 
where the wires go, forfuture reference. 
That completes the board wiring. 

At this point you can install the IC's. 



Refer to Figs, 15 and 16 



nal assembly 

The time has come to install the 
hoards in a case and to connect the 
cables. But first, a few comments about 
the cabinet you should use. The proto- 
type used a leftover cabinet from a piece 
of medical equipment. It's not available 
commercially but you can probably do 
just as well with an "off the shelf 
product. When you shop for a cabinet, 
look for one that is at least 3 inches by 8 
inches wide by 7 inches deep. That 
the size of the prototype's cabinet, and 
3 hold the boards. Also, it 
should be all metal for shielding. If you 
a plastic cabinet, the unshielded 
elerfronics may interfere with sensitive 
measurements. Knowing those two re- 
quirements, you are all set to visit your 
electronics supplier and make a selec- 
tion. You might even want to use a plain 
chassis box to keep costs down. If paint- 
ed and labelled carefully, the box can 
look better than most cabinets ! 

Once you have a suitable cabinet you 
can lay out the boards and controls. 
Probably the best arrangement is the 
simplest, so you might want to copy the 
layout shown in Fig. 17. Otherwise, 
just be sure to space the control and 
VCO boards as close together as practi- 
cal: the rest isn't critical. 

Here are some tips to make the board 
layout easier. The only areas to be con- 
cerned about are the front panel and the 



bottom. Since the front panel holds only 
parts, us not a problem. That 
leaves the bottom of the cabinet. Posi- 
tion all three boards on it in determine 
where to mount (hem: then use the 
boards themselves as templates to mark 
the mounting holes. 

Be sure to allow extra room at the 
front of the cabinet for the switches 
About three inches of clearance should 
; the minimum. Also, if you can. 
tnt the switch board near the front 
^xrttom of the cabinet. That al- 
ows easier access to the control board, 
which was partly covered by the switch 
board in the prototype — not such a good 
arrangement from a service standpoint. 
With those suggestions, board place- 
ment should be easy to determine. 

The next step is to machine the cabi- 
net. You can start with the bottom of the 
cabinet by drilling out the mounting 
holes for the boards. Then drill a hole in 
the rear panel for the power cable. It 
may be necessary to enlarge it so that a 
grommet can be installed to protect the 
cable. (We used a plastic strain-relief 
salvaged from a junked appliance.) You 
can now drill the front panel. Generally, 
it will be necessary to clamp the pane! in 
a vise so the holes can be drilled accu- 
rately. Be sure to protect the panel's 
finish by placing a piece of cloth be- 
tween it and the jaws of the vise. When it 
comes to making the cutout for the fre- 
quency SET switches, probably the best 
way is to drill small holes around the 



T \ '/< 4001 | IC3M* 
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FIG. 13— A SEVEN-SEGMENT LED DECODER, IC301, Is put to a rather unorthodox use on the switch 
board. Its segment-output states determine which of the generator's VCO's will be active. 



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FIG. 14 — FULL SIZE FOIL PATTERN for the switch board. Large pads are used to make off-the-board 
connections. 



8-CQNDUCTOH 
RIBBON CABLE 



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3-CONDUCTOfi 
RIBBON CABLE 
5-10 



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FIG. 15— EIGHT-CONDUCTOR RIBBON CABLE is used between the board and PL1 , The plug itself Is an 
8-pln DIP header. If you can't locate one, cut down a 1 4- or 1 6-pin header. 



inside of the outline, knock out the cen- 
ter, and file the opening to size. 

After the holes have been drilled, 
scrub the cabinet with detergent and 
water to remove any grease. Then rinse 
and rub it dry. Next, label the front 
panel with press-on letters, label tape, 
or anything else you care to use. We 
used press-on letters successfully, and 
you can do the same. One thing, though, 
and that is when you get to the range 
switch, use several labels. Include 3-30 
MHz beiow hi, and 0.3-3 MHz below lo. 
The extra labels make the range switch 
easier to use. Other than that, simpiy 
label the controls according to the pro- 
totype , Be sure to cover the labels with a 
coat of acrylic spray so that they don't 
rub off. 

Once the spray is dry you can install 
the boards in the cabinet and hook them 
up. You can install the VCO and switch 
boards immediately, but hold off on the 
control board because a few wires must 
be connected to it first. 

Cut three six-inch pieces of RG-174 
50-ohm coaxial cable, and prepare the 
ends. Don't substitute ordinary mike 
cable for this miniature coax — it's too 







PARTS LIST— SWITCH BOARD 

All resistors Vi-watt, 5% 

R1 — 5000 ohms, potentiometer, linear 
taper with switch 

R301-R306— 100.000 ohms 

R307-R309— 10,000 ohms 

Capacitor 

C301— 0.1 F, 16 volts, ceramic disc 

Semiconductors 

IC301— CD<!511 CMOS 7-segment latch/ 
decoder/driver 

IC302— CD4012 dual 4-input CMOS NAND 
gate 

IC303— CD4081 quad 2-input CMOS AND 
gate 

IC304— CD4001 quad 2-input CMOS NOR 
gate 

Q301-Q303— 2N3904 or equivalent 

LED1 — jumbo red LED 

D301 — 1N4148or1N914 

S5, S6— SPOT toggle switch 

T1 — wal t-plug trartsf rmer, 1 2 volts, 600 mA 

PL1^6-pin DIP header 

J1 — BNC connector, chassis-mount 

Miscellaneous: PC board. IC sockets, V2- 
inch threaded standoffs, metal enclo- 
sure (see text), knob, RG-174 coax, rib- 
bon cable, etc. 

A complete set of three boards for the 
Programma-2 is available for $22.00 
ppd, from: Technico Services, PO Box 
20HC, Orangehurst, Fullerton, CA 
92633. CA residents please add 6% tax; 
foreign orders please add $3.00 for 
shipping. Order No. SSG-1. 

A complete set of parts, excluding 
boards, crystal, transformer and case, 
Is available for $112.00 ppd. from: Cir- 
cuit Specialists, Inc., PO Box 3047, 
Scottsdale, AZ 852S1. Order No. KT-5. 
Phone orders (800) 528-1417; all other 
Inquiries (602) 966-0764. AZ residents 
please add tax. 




FIG. 16— NOTE THE WAY the leads of resistors 
R307 and R309 are bent. 



FIG. 17— CONTROL AND VCO BOARDS are 
mounted aide-by-aide. Switch board, not seen 
here, sits above coils at lower right. BCD thumb- 
wheel-switches are visible at top ot photo. 

lossy. Solder one end of a cable to the 
vco pads (below QI0I) on the control 
board. Note that there is a pad for the 
shield of the cable, even though it 
doesn't go anywhere. That is intentional 
and not a mistake. Solder one end of 
another cable to the div pads (near 
C I0l>- Connect one end of the remain- 
ing cable to the MOD pads (near R128), 
Finish up by cutting two six-inch pieces 
of hookup wire, and stripping the ends. 
Solder one wire to the pwr pad (above 
CI 06). and the other to the -:v pad (at 




FIG. 18 — INTERCONNECTIONS between all boards. Extensive use of color-coded ribbon cable keeps 
things neat and makes circuit-tracing easy. 



RI27>. That takes care of the control 
board, and you can now mount it in the 
cabinet. 

The last construction step is to inter- 
connect the boards. Refer to Fig, 18 for 
details as you make the connections. 
Start by attaching RCA-type phono 
plugs to the ends of the coax cables from 
the control board. Then piug each one of 
them into the appropriate jack on the 
VCO board. Next, connect the leads 
from PWR and -2V pads on the control 
board to the appropriate terminals on 
the VCO board. Double-check to be 
sure they go to the right places; other- 
wise you may damage the control board. 
Connect level pot Rl. and power 
switch S7. Wire up the pot first, using 
hookup wire to connect it to the board. 
Then wire up the power switch. If you 
use an external wall-plug type trans- 
former, alt that's necessary is to wire the 
switch in series with the VCO board and 
transformer. If you can't find such a 
transformer, and use an internally- 
mounted unit, switch the transformer's 
primary instead. 

Next is the rf output jack. Cut a 
piece of RG-174 coax long enough to 
reach from the jack to the rf out jack on 
the VCO board. Then attach an RCA 
plug to one end of the cable and plug it 
into the VCO board. Solder the other 
end to the jack, and be sure to make a 
good ground connection. That is im- 
portant because that connector is the 
only ground in this project! Connect the 
range switch, S6, by running three 
pieces of hookup wire from it to the 



VCO board. (Ribbon cable is great for 
that!) 

Finish up with the switch board con- 
nections. Plug PL 101 into the 8-pin 
socket on the control board, and then 
connect the three wires to the corre- 
sponding pads on the VCO board. 

That completes the construction. 
Double-check your work and correct 
any problems you find before applying 
power. 

Calibration 

In all probability, the Programma 2 
will work pretty well the first time 
power is applied, without any calibra- 
tion. Still, a few adjustments are re- 
quired to insure that you Can get all fre- 
quencies set by the switches, and to set 
the modulation level and get the best 
accuracy. To make the adjustments 
you'll need either a receiver with 10- 
MHz WWV capability, or a frequency 
counter. For tools you'll need a hex 
alignment-tool for the coils, and a small 
screwdriver. 

The first step is to set the frequency 
range of the VCO's. That means that the 
coils must be adjusted so that the VCO's 
cover 3-5 MHz, 5-t0 MHz, and 10-30 
MHz. The front ERROR lamp will show 
when the coils are adjusted properly. 

Make the adjustments in this order: 
Set the switches to "03.00" and turn on 
the power. The ERROR lamp may be lit or 
flickering. If it isn't, adjust L203 on the 
VCO board until it shows some sign of 
life. Then adjust the coil until the lamp 
goes out, and keep turning the core for 



about !^-tum more. Switch to "04,99." 
and check the lamp; it should blink and 
go out. If not, back off the core slightly. 
The lamp should now blink and go out 
for switch settings of "03.00" through 
"04.99." 

Set the switches for "05.00." Again, 
the error lamp may be lit or flickering. 
If not, adjust L202. Then adjust the core 
until the lamp goes out, and turn the 
core about l /i turn more. 

Now switch to "09.99," and check 
the lamp, it should blink, and then go 
out. If not, back off the core slightly. 
The lamp should blink and go out for 
switch settings of "05.00" through 
"09.99." 

Set the switches for "10.00." The 
ERROR lamp may be lit or flickering. Ad- 
just L201 for some indication. Then ad- 
just the core so that the lamp goes out, 
and turn it about Vi-tum farther. Switch 
to "30.00" and check the lamp. It should 
blink and go out. if it doesn't, back off 
the core slightly. The lamp should blink 
and go out for switch settings of " 10.00" 
through "30.00" MHz. 

That takes care of the VCO frequen- 
cy-range adjustments. Now for the 
modulation-level adjustment. It can be 
made with an ordinary AM table-radio. 
Otherwise, you can use a shortwave re- 
ceiver set to about 3 MHz. Here's how 
to make the adjustment: 

Set your receiver to a clear frequency. 
Set the FREQUENCY set switches to the 
same frequency. Then flip the modula- 
tion switch to am. Connect a piece of 
continued on page 77 



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69 



YOU ALREADY 

OWN HALF OF THE 

WORLD'S MOST ADVANCED 







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How to Connect your VCR 
to More than One TV 

A MATV system can be used to distribute program material from a VCR. 
Here are some suggestions for getting the most out of a combination of the two. 

JAMES E. KLUGE 



THERE'S LITTLE DOUBT THAT VCRS {VIDEO CASSETTE RE- 

corders) are here to stay. With their tremendous popularity 
(sales of over one million units are expected this year alone), 
VCR's are appearing in more and more homes and places of 
business. 

In most cases a VCR is connected to a single television set, 
but what happens when you want to connect more than one 
set to a VCR? Since a VCR both accepts and generates 
signals that are equivalent to those used by TV receivers, it 
can generally be connected to an MATV (master antenna) 
system. Here are several recommendations for integrating a 
VCR into an MATV setup. 

Connecting a VCR to a single TV set 

Most VCR's offer a choice of output on either channel 3 or 
channel 4 (some also have channel-5 or channel-6 outputs); 
the output channel you choose will depend on the channels 
not in use in your area. 

The VCR is most likely to be located next to the most-used 
TV set in the house. VCR's usually have a built-in VHF/ 
UHF tuner; the VHF input is 75 ohms, and the UHF input is 
300 ohms. The VHF hook-up is made by connecting the 75- 
ohm VHF antenna lead to the VCR's input and the unit's 
switched-output (tape or off-the-air) to the TV-set's VHF 
antenna-terminals. 

While most VCR's also accept UHF signals, there some- 
times isn't any provision included for bypassing the video 
cassette recorder so that you are able to view those signals 
directly. In that case, you will need to use a signal splitter as 
shown in Fig. 1. 

MATV hookup 

If you wish to connect additional sets to a VCR. the best 
way to go about it might be to tie the VCR and the sets 
into an MATV system. That will provide extra benefits, in- 
cluding the option of restricting the VCR signals to only cer- 
tain outlets or TV sets. 



IN VHF-ONLV AREAS. 
CONNECT 

ANTENNA DIRECTLY 
TO VHF INPUT OF VCR 




SPUTTER 



FIG. 1— THIS IS HOW a VCR is connected to a single television set. In the 
case Of some VCR's the UHF signal must be split as shown it you wish to 
watch it directly. 

A small MATV/ VCR system is shown in Fig. 2. First of 
all, the output from the VCR should be injected at the head- 
end (the point where the signal enters the system — the lead 
from the antenna in this case) instead of being connected 
directly to the TV receiver as was the case in Fig. 1 . If there 
is a blank channel in your area that corresponds to the VCR's 
RF-converter frequency (and does not have an occupied 
channel adjacent to it), then a simple two-way splitter con- 
nected in reverse is adequate to combine the VCR- and off- 
the air-signa!s at the headend. 



72 




FIG. 2— IN A SMALL MATV/VCR SYSTEM, the output of the VCR's RF 
converter should be Injected at the headend. The setup shown here is 
recommended If there is an adjacent-channel interference problem. 




Adjacent channels 

If you have an adjacent-channel situation, where an off- 
the-air signal may interfere with that from the VCR — or vice 
versa — a single-channel separator/coupler with a plug-in 
filter tuned to the VCR's RF-converter frequency, and 
isolated from the adjacent-channel source by a two-way 
splitter, will be required. That is the set-up shown in Fig. 2. 
In a- typical example, channel 4 might be in use in the area 
and the VCR's output selected to be on channel 3. The 
channel-3 bandpass filter will confine the sideband energy of 
the channel-3 signal so it will not interfere with the channel-2 
or channel-4 signals arriving at the TV tuner. The isolation 
provided by the splitter will reduce adjacent-channel loading 
of the filter. It will also serve to minimize any possible radia- 
tion of the VCR signal by the antenna, something the FCC 
frowns upon. 

In the system shown in Fig. 2, instead of going directly to 
the TV receiver, the VCR's output goes back to the headend 
through a distribution amplifier. The receiver gets its signal 
from a wall outlet or wall tap via a splitter which is used to 
feed both the VCR and TV-receiver inputs. To minimize 
losses, the splitter is located between the wall outlet and the 
TV equipment. If the VCR's output were split and sent to 
both the receiver and the headend, that would mean an ad- 
ditional splitter in the circuit. The insertion loss of that split- 
ter, coupled with the loss from the VCR's internal splitter, 
might weaken the signal enough to produce a snowy picture. 
Furthermore, programs could not be viewed off-the-air 
while the VCR was in the play mode. 

The signal level from the wall tap or outlet must be high 
enough to overcome the 3 W-dB insertion loss of each split- 
ter. For the system shown in Fig. 2, the signal must survive 
the losses caused by the splitter inside the VCR, and by the 
splitter between the wall outlet and the VCR — a total of 7 
dB — and still be strong enough to provide an adequate signal 
level at the VHF tuner of the VCR. A distribution or line 
amplifier may be required after the headend, and/or at the 
output of the VCR, to overcome the losses introduced by the 
splitters. 

Another important point to keep in mind is that optimum 
adjacent-channel reception is possible only when the signals 



FIG. 3— A VHF-TO-UHF CONVERTER can be used in situations where a 
co-channel Interference problem exists. In areas where UHF channels 
are in use, make sure that the output of the converter Is higher in fre- 
quency than any of those channels. 

on the adjacent channels are equal in level. In many cases, 
in-line or plug-in pads (attenuators) will be required to 
balance things out. 

Go-channel problems 

Suppose you live in an area where both channel 3 and 
channel 4 (or 5 and 6) are in use. What do you do when your 
VCR also uses those channels for output to a TV receiver? 
That is known as a co-channel problem and can be handled 
only by converting the VCR's channel-3 or channel-4 output 
to a UHF channel, which requires a VHF-to-UHF converter 
as shown in Fig. 3, The converter is a common piece of 




FIG. 4— IN SOME CO-CHANNEL INTERFERENCE situations, a VHF-tO- 
UHF block converter is more economical to use than several single- 
channel converters. 



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73 




FIG, 5 — BLOCK CONVERTERS can also be used to connect two or more 
VCR's to an MATV system as shown here. 




SUBCHANNEL- 

TO-VHF 
CONVERTER 



UNRESTRICTED TAPS 
ON MATV SYSTEM 



RESTRICTED 
TRUNK LINE 



FIG. 6— ONE WAV TO RESTRICT reception of VCR programs Is to con- 
vert the VCR's output to a subchannel frequency. 



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UNRESTRICTED 
PROGRAMS 
(ANTENNA ONLY) 



RESTRICTED 
PROGRAMS 
(ANTENNA & VCR) 



VCR 



FIG. 7— A DIRECTIONAL COUPLER can also be used to limit who can 
watch VCR programs. In the arrangement shown here, only the sets 
connected to the coupler's taps can receive the signal from the VCR. 



equipment used by MATV contractors. It can be obtained 
through many local electronics distributors, although you 
may have to place a special order to have it tuned to the 
UHF channel you want. The converter should be located as 
close to the headend as possible to minimize the higher 
cable-loss experienced at UHF frequencies. The converter's 
UHF output may be fed to the UHF-side of a VHF/UHF 
splitter (separator)-coupler, while the VHF antenna-lead is 
connected to the VHF-side. The combined signals may need 
to be amplified before being distributed over the MATV 
system. 

You may run into a situation where it is necessary to 
convert the VCR's output to a UHF channel in an area 
where one or more UHF channels are in use. For maximum 
coupling-efficiency in such a case, you should make sure 
that the frequency of the output-channel of the VHF-to-UHF 
converter is higher than that of any of the over-the-air UHF 
channels that reach the separator-coupler. 

A VHF-to-UHF converter that will convert the entire 
block of VHF channels to UHF is also available. Using 
that block converter may be a less expensive approach in 
some cases than using factory-tuned single-channel con- 
verters. A setup using the block converter is shown in Fig. 
4. 

A block converter can also be used when you want to 
connect two or more VCR's to the MATV system. Such an 
arrangement is shown in Fig. 5. 

Restricted programs 

Now that we have discussed some of the interference 
problems that you may encounter, let's consider the case 
where you may want only one or more selected TV sets on 
the MATV system to be capable of receiving programs from 
your VCR. There could be many reasons for needing that 
capability. In an industrial or commercial setting, it may be 
for security; at home, there might be movies or programs 
unsuitable for younger members of the family. In either case 
the basic solution is the same, although there can be varia- 
tions depending on the particular situation. 

One approach is to put the VCR program -mate rial on a 
subchannel frequency. To do that, the audio and video out- 
puts of the VCR {not the RF-outpuO are fed to a subchannel 
modulator to provide a modulated RF signal on one of three 
HF — //igh Frequency — channels (channel A: 18-24 MHz; 
channel B: 30-36 MHz, and channel C: 42-48 MHz). Then— 
as shown in Fig. 6 — at some point ahead of the TV sets that 
are intended to receive the VCR program, a subchannel 
separator picks off the subchannel program from the MATV 
trunk-line and applies it to subchannel-to-VHF converters 
that feed only those TV sets intended to receive the VCR 
programs. 

Another approach is to convert the VHF output from the 
VCR to a UHF channel. Then, either place traps tuned to 
eliminate that channel in the line that feeds the sets that you 
do not wish to receive the VCR signal, or disable the UHF 
tuners in those sets. If there are only a few sets involved, 
traps tuned to the VCR's VHF output-channel can be placed 
in the lines feeding the TV sets you do not wish the VCR 
signal to reach. 

A directional coupler can also be used to restrict viewing. 
An arrangement using such a coupler is shown in Fig. 7. 
Signals from the VCR are applied to the feedline output of 
the coupler; signals from the antenna are fed into the input. 
Approximately 30 dB of isolation prevents the VCR's 
signals from reaching the input jack, but TV sets connected 
to the coupler's taps will be able to receive those signals, as 
well as those from the antenna. No other sets in the MATV 
system will receive signals from the VCR. 

How you eventually set up your MATV/VCR system 
will, of course, depend on your specific requirements. But 
whatever form the system takes, you can be sure that follow- 
ing these suggestions will help you get the most out of it.R-E 



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if there were 
no distributors? 



If there were no electronics distributors . . . we'd have to 
invent them! As manufacturers of electronic products, 
we're convinced that the absence of distributors would 
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source for fast off-the-shelf delivery of needed products. 
Production lines would grind to a halt. . . . handling small 
orders would be a nightmare. Paperwork would increase; 
costs would increase; expediting would increase; chaos 
would increase. 

As a buyer of electronic components, you benefit from 
the existence of distributors, even when you don't directly 
utilize their services. They make the factories you deal 
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economy of scale. And, whether you need a source for 
fast delivery of standard products, for comprehensive 
technical information, or for assistance on any aspect of 
your procurement function, your local distributor can — 
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Distributors help us — by serving you. 

As members of the Distributor Products Division of the 
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For information about joining with other manufacturers 
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Street N.W., Washington, D.C. 20006. Telephone (202) 
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DISTRIBUTOR 

PRODUCTS 

DIVISION 













RF GENERATOR 



continued from pane 69 



wire to the rf output jack, and advance 
the level control. Tune in the signal on 
your receiver carefully. Adjust the pot 
on the control board for a clean-sound- 
ing tone, then turn the pot until the tone 
sounds rough. Back off the adjustment 
so that the tone sounds clean again. That 
completes the modulation adjustment. 

The last step is to adjust for the best 
frequency calibration. You can either 
use a counter for that, or station WWV 
at 10 MHz. Here's how to do it: 

Put the MODULATION switch in theCW 
position, and the range switch to hi. 
Then set the frequency switches to 
" 10.00," Connect a piece of wire to the 
RF OUTPUT jack for an antenna if you are 
using a receiver for calibration; other- 
wise, connect a frequency counter to 
the jack. 

If you are using a receiver for calibra- 
tion, tune in WWV at 10 MHz. Advance 
the level control on the RF generator 
until you can just hear its carrier beating 
against WWV's 10-MHz signal. Then 
adjust the trimmer on the control board 
for the lowest-pitched beat note. There 
may be a slight warble in the project's 
carrier: that is a normal characteristic of 
synthesized RF-generators, and some 



care will be required to find zero beat. 

If you are using a counter, simply ad- 
just the trimmer on the control board 
until you read 10.000 MHz. 

Using the Programma 2 

Using this RF generator is a snap be- 
cause there are so few controls, A few 
comments on the key controls, though, 
are in order. 

Remember that the range of the fre- 
quency Set switches is "03.00" to 
"30.00" (MHz). If you exceed those 
limits, the error lamp will come onto 
remind you that the frequency is wrong. 

The range switch selects direct, or 
divided-by-10, output frequencies. Use 
the Hi position for outputs of 3 to 30 
MHz, and LO for 300 KHz to 3 MHz. 
Typically, the hi position will be used 
for RF-stage and mixer-alignment of re- 
ceivers , while the LO range will be used 
for IF alignment. 

The error lamp serves as a visual 
reminder that the output frequency is 
not the same as that indicated by the 
FREQUENCY SET switches. In normal op- 
eration, it should blink once when the 
frequency is changed. If a value is 
selected outside the range of the FRE- 
QUENCY SET switches, it will stay lit, 
alerting you to your mistake. 

To use the Programma 2, simply se- 
lect the desired frequency and range. 



Then adjust the level control as neces- 
sary. If you are working on a receiver, 
tune in the signal on the receiver first; 
then adjust the level control as 
required. 

If you must work with low-level sig- 
nals , insert a 50-ohm attenuator at the RF 
OUTPUT jack and then set the attenuator 
for the desired output level. That may 
not always be necessary, as the RF out- 
put of this project with a 50-ohm load 
ranges from 10 mV to 300 mV. R-E 



HtfiJ 



A Holiday Thought 

Reminding you that USO is 
there holidays. ..and every day 
for our young servicemen and 
women. USO; "A HOME AWAY 
FROM HOME" for 40 years. 

Judd Hlrsch 



Svenn USO throian th# Uivih] vii* OCFC. v Wi U40 wMEwtflfl 




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To order from this ad: Check off the books you want. Total the prices. 
Add in shipping. NY State residents add Sales Tax. Total it up, enclose 
your check and mail. 

□ 28 Tested Transistor Projects 53.50 

□ Single IC Projects $3.95 

□ Digital IC Projects $4.95 

□ Electronic Test Equipment Construction $4.50 

□ 1st Book of Hi Fl Loudspeaker Enclosures $3.25 

H 50 Circuits Using Germanium Silicon and Zener Diodes $3.50 

□ Practical Computer Experiments $4.75 

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ELECTRONIC TECHNOLOGY TODAY INC. 

P.O. Box S3, Massapequa Park, NY 11762-0083 

Price of Books 

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(60c 1 or 2 books. 25c each add I.) . 

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77 



HOBBY CORNER 



Homemade remote sensors for your home weather-station. 

EARL "DOC" SAVAGE, K4SDS, HOBBY EDITOR 



JUDGING BY THE MAIL. THERE IS AN IN- 

creasing interest in, and concern about, 
the weather — what it is, what it was, 
and what it will be. One reason for that 
concern may be the high cost of energy 
for heating and cooling, and how 
weather effects those costs. In any 
event, I've received many questions 
concerning electronic weather-instru- 
ments recently. 

Your questions seem to indicate that 
the main problem is devising sensors or 
detectors. Most of you know how to 
evaluate a signal and display the result, 
but you need something that will gen- 
erate the signal in the first place. 

The first thing that I think of when I 
hear the words "weather instrument" 
is an anemometer (an instrument that 
measures wind speed and force) whirling 
around. There are, of course, several 
types of devices that can be used to in- 
dicate how hard the wind is blowing. 
Some of them are shown in Fig. I. 

A simple wind paddle attached to the 



vices shown in Figs, l-c and l-d. In Fig, 
I-c, cup-shaped air scoops are attached 
to the motor's shaft as shown. Those 
scopes can be easily made from ping- 
pong balls that have been sliced in half 
or from panty-hose containers. A similar 
device using vertical disc -shaped air- 
foils in place of the scoops is shown in 
Fig. l-d. 

In the device shown in Fig. I-e, air 
scoops are used to rotate a free- turning 
shaft mounted in a roller-skate wheel. 
A counterbalanced crossbar with a 
permanent magnet on one end is at- 
tached to the shaft as shown. Each time 
the magnet passes a reed switch, that 
switch closes. The number of switch 
closures can be counted with a fre- 
quency counter or similar circuit and 
translated into wind speed. 

A phototransistor can be used in 
place of the reed switch in Fig. I-e. Re- 
place the permanent magnet with a bit 
of reflective material. The phototransis- 
tor will generate a pulse each time the 










since you probably won't be able to 
find a calibrated anemometer, you'll 
have to find another way. Perhaps the 
best method is to take the device for a 
ride in your car. 

Pick a calm day, and get a friend to 
do the driving. Hold the sensor out the 
window, and drive up and down a road 
at several different speeds, calibrating 
your anemometer against the car's 
speedometer. To cancel the effect of 
any wind that may be present, drive 
both ways at each speed and average 
the readings you take. Using that 
method, you can calibrate your ane- 
mometer sensor at several wind speeds, 
and interpolate at others. 

One more point before we go on. The 
sensors shown in Figs. 1-aand l-b must 
be set on a vane so that they face into 
the wind. That could present a problem 
because the wires may wrap around the 
support and, for that reason, the other 
designs are more frequently used. 

The next type of sensor, shown in 
Fig. 2, is used to determine wind direc- 
tion. A standard wind vane, mounted 
on the shaft of a potentiometer, is 
shown in Fig. 2-a. The pot's resistance 
is used to indicate the wind direction. If 
you use that design, be sure the pot you 
choose can be taken apart so that the 
stop can be removed — you'll want the 
shaft to turn without restriction. Use a 
skate wheel as a thrust bearing. 

The design shown in Fig. 2-b is similar 
to the one shown in Fig. I-e for measur- 



shaft of a potentiometer is shown in 
Fig. Fa. When the wind blows, its force 
pushes the paddle back, turning the 
shaft of the pot. That, of course, raises 
(or lowers) the resistance bet wen the 
wiper and one end of the pot. The hard- 
er the wind blows, the higher (or lower) 
the resistance. It's a simple matter to 
measure the resistance from a remote 
location. 

Figure I-b shows a propeller attached 
to the shaft of a small permanent- 
magnet motor. The wind turns the pro- 
peller, causing the motor to act as a 
generator and produce a voltage. The 
faster the propeller turns, the higher 
that voltage. Again, it is fairly easy to 
measure the voltage from a remote lo- 
cation. 

The same motor is used in the de- 




material passes it. (Of course, the sen- 
sor will not work at night unless you 
provide some illumination.) 

Calibrating those devices can be a bit 
of a problem, The task is easy enough if 
you have access to a similar unit that is 
already calibrated — just match your 
readings to the ones it shows. But, 



ing wind speed. The difference is that 
this time there is a circle of reed 
switches; as before, one of the switches 
will close when the crossbar-mounted 
magnet is in its vicinity, thus indicating 
the wind direction. It's a simple matter 
to connect each switch to an LED or 
lamp to make a remote readout. 



78 



"\bu 
fix T VS... 

what brand 
should I 



You're on the spot. 
Any set you tell your 
customer about has a 
chance of failing sometime. 

But though we're not 
saying we're perfect, we'd like 
you to recommend RCA. 
Because we're sure your 
customer will love its picture 
performance. 

You can find the 
problem and repair it 
quickly if anything does 
go wrong. Because with 
RCA's unitized chassis, 
failures are easy to handle. 



get? 

RCA gives frequent 
hands-on workshops, as 
well as lectures. So when 
failures do occur, you'll 
be ready. 

RCA has more than 
500 parts distributors 
nationwide. We have this 
large network because we 
don't want you to have to 
wait too long for parts. 

We also keep your 
inventory expenses lower by 
using components instead of 
modules, in most circuits. 



^ ^ We know your 

customers think you're 
responsible for everything 
about their sets. 
Good and bad. 
And that's why we here 
at RCA are doing everything 
possible to make sure that 
when you finish a service call, 
everybody's smiling. Your 
customers happy with your 
recommendation. 
And you're still the 
expert. 



RC/1 

RCA IS MAKING 
TELEVISION 
BETTER AND BETTER 



For your free subscription [o RCA COM- 
MUNICATOR, our inttgiuine <jf new* and advice for 
service technicians, write RCA, Dept. 1-455. 600 \orih 
Sherman Drke, Indinnnpiilk, \S Ifi2fl1- 




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A less reliable — but less costly — way 
to determine wind direction is shown in 
Fig. 2-c. The weight is connected to a 
piece of bare wire that passes through a 
ring of contacts. When the wind blows, 
the wire will touch one of the contacts, 
completing a circuit. 

The most expensive way to determine 
wind direction would be to use a pair of 
selsyns {DC remote-control devices 
that use the angular position of a shaft 
in the transmitter to control the posi- 
tion of an indicator in the receiver). 
Perhaps you can find surplus units. 

Using a barometer to determine air 
pressure is the easiest of all. Since the 
pressure is the same inside the house as 
outside, a re mote- reading instrument is 
not needed. Just keep a store-bought 
barometer on the shelf with your other 
weather equipment. 

Designing a remote-reading rain 
gauge is quite another matter; the job 
can get quite involved. One possible 
design is shown in Fig. 3. A counter- 
balanced arm is mounted on the shaft of 
a potentiometer. A spring is used to 
hold an empty cup in the "zero" posi- 
tion. When it rains, water runs into the 
cup through the funnel. The weight of 
the water in the cup causes the pot's 
shaft to turn, changing the resistance of 
the pot, and the resistance measured 
can be converted into "inches of 
precipitation." 




5«ACH0JCt CMSc 
ATTACHED TO 

POINTER 




SERIES Of 
P^OTOC&Li.^ iH 
NOL£S IN 
ORIGINAL St/)<.£ 



FtG. 4 



The solenoid is used to empty the 
cup; it opens a drain hole in the bottom 
when a voltage is applied. Another way 
to empty the cup from a remote loca- 



tion is to use a solenoid to tilt the 
counterbalanced arm. In either case, 
this is a real "Rube Goldberg" affair. 
Perhaps you'd be better off just using a 
standard rain gauge and walking out- 
side to read it. 

Measuring air temperature is straight- 
forward and many articles have been 
written about building remote -reading 
thermometers. In addition, many man- 
ufacturers offer electronic kits for that 
purpose. There is also the older, non- 
electronic, type of remote-reading 
thermometer that has a capillary tube 
running outside. 

A remote-reading hygrometer for 
measuring humidity is another instru- 
ment that will require some jury-rigging. 
About the best I can suggest is shown 
in Fig. 4. Take a standard dial-type 
hygrometer, replace the dial with 
photocells as shown, and attach a disc 
to the pointer. The disc will shade a 
photocell when it passes in front of it, 
making it possible to determine the 
pointer's position from a remote 
location. 

An instrument that measures the 
amount of sunlight over a given period 
of time is shown in Fig. 5; it consists of 
a photoresistor connected to a counter 
through a threshold circuit. Whenever 
the sunlight reaches a predetermined 
level, the counter runs, giving you the 
hours {or any other convenient time 







o 

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9 

80 







An enclosure as 
good as your idea. 




You've turned a good idea into a piece of equipment— 

now you need a good enclosure. Here's how PacTec 

can help you with our versatile enclosures: 

•Attractive yet inexpensive. » Durable ABS construction. 

• Many sizes, colors, accessories. • Built in 

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unit) of sunshine since the last time the 
counter was reset. For accurate mea- 
surements, be sure to keep the photo- 
resistor clean. 




FIG. s 

That should keep you meterologists 
busy for a while. If you come up with 
any other ideas, or improvements on 
the ones presented here, let me know 
and I'll pass them along. 

Electronic hobby kits 

The people at OK Machine and Tool 
Corp. (3455 Conner St., Bronx, NY 
10475) have come up with five low-cost 
electronics kits that I'm sure you will 
find quite interesting. You'll wind up 
with a useful device, and have an oppor- 
tunity to leam something about elec- 
tronics in the process. 

The kits available are named: Quick 
Reaction (a game). Electronic Organ, 
Digital Roulette, Electronic Dice, and 
Morse Code Practice {an audio oscilla- 
tor); each one sells for less than S 15.00, 
and comes complete with everything 
except batteries and tools. The plastic 
packages the kits come in double as 
cases for the projects. The instructions 
are detailed and clear, and even a first- 
time builder should have little trouble 
completing any of the kits. 

Do you know a young person who 
you would like to nudge into elec- 
tronics? You won't find a better way 
than to present him for her) with one or 
more of those kits. An assembled kit 
may be appropriate for a younger child. 
The roulette and dice devices can be 
used with other games, and seeing the 
internal parts is sure to arouse the 
child's curiosity. R-E 




' 'Sometimes 
stamps, like 



f wish you collected 
other men." 



HllKraat 

Catalog 



Discover the newest 
in electronics for your 
home and business: 

• Computer hardware and software 

• Precision test instalments 

• Energy savers for car and home 

• Self-study programs in electronics 

• Fire stereo components 

• Color TV's and video accessories* 

• Amateur radio gear 

...all in easy-to-build 

money-saving kits. 






If coupon is missing, 

write Heath Co., 

Dept. 030-832 

Benton Harbor, 

Ml 49022 

In Canada, write 

Heath Co., 

1480 Dundas 

Highway East, 

Mtssissauga, Ontario 

L4X 2R7 



Send today for the all-new, tree Heathkit 
Catalog... with 104 pages describing nearly 
400 exciting kits tor your electronics hobby. 



Please send my free Heathkit Catalog. 
I am not currently receiving one. 
Send to: Heath Co., Dept. 020-832 
Benlon Harbor, Ml 49022 




Name. 



Address. 
City 



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CL-751 



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CIRCLE 31 ON FREE INFORMATION CARD 



J 2 
61 



COMPUTER CORNER 



Looking for a computer 

KATHY TEKAWA* 



BUYING YOUR FIRST MICROCOMPUTER 
can be an incredibly complex task. 
Once you begin your search you'll 
quickly encounter confusing termi- 
nology, a seemingly endless variety of 
systems, smooth-talking salesmen, and 
— most confusing of all — a constant 
barrage of new equipment and pro- 
grams, and enhancements to existing 
ones. It will be enough to make you 
want to stick with paper, pencils, and 
filing cabinets. 

But don't despair — you don't have to 
tackle it all at once. Approach the 
matter in small, logical stages. The 
first, and most important, step is to task 
yourself what you intend the computer 
to do for you. How do you plan to use it 
to improve your operation? What parts 
of your day-to-day workload will benefit 
from increased efficiency due to the 
computer? 

For large and complex business op- 
erations, that task is best undertaken 
by a system analyst — a professional 
consultant trained in analyzing work 
procedures determining which should 
be computerized and exactly how that 
should be done. 

For smaller operations, you can 
probably save the expense of hiring 
such a consultant by doing your own 
detailed study of what, exactly, you 
want your computer to do. Collect as 
much information as you can. If you in- 
tend to prepare a payroll using the com- 
puter, determine how many checks will 
be written each pay period. Make a list 
of all the categories that will be involved 
(gross pay, federal tax, state and local 
taxes. Social Security, other income to 
withheld or added, etc.). If you're going 
to be keeping an inventory, how many 
classes of items will be involved: how 
many categories (in stock, shipped, in 
transit, etc.). The more detail you can 
provide when you visit a computer 
store, the better the salesmen will be 
able to help you to determine your 
hardware and software (program) 
needs. 

Finally, think not only in terms of 
what you intend to do with the system 
when it's installed, but also what you 
would like to do with it in the future. 

Once you have a good idea of your re- 

'Managing Editor. Interface Age Magazine 



quirements, your next concern is to 
find the best buy. That does not neces- 
sarily mean the cheapest price. Careful 
shopping for price is fine, but that's an 
area requiring a good deal of judgment: 
a "bargain" computer could turn out to 
be a costly mistake. You should also 
consider such things as the reputations 
of the dealer and manufacturer, avail- 
ability of service, and the capability of 
your system to expand along with your 
understanding of it. Not only should 
your computer be able of handling your 
immediate needs — it should also be 
able to handle them one or two years 
from now. 

Some representative products 

To get you started thinking, and to 
give you an idea of some of the basic 
systems available, we've prepared a list 
describing a few of the wide array of 
products on the market. Prices range 
from as low as $400 up to approximate- 
ly $2000. (Depending on the options 
purchased and the dealer you buy from, 
prices can vary considerably; therefore 
they have not been included here.) 

Bear in mind that this list is just a 
sampling of what's available, and is not 
intended as an endorsement of any of 
them, or to indicate that they are the 
cream of the crop. The computer men- 



tioned are simply a few of the most 
prominent and widely-distributed sys- 
tems, from a handful of manufacturers. 
The system you ultimately purchase 
will depend largely on your individual 
needs. 

Apple: The Apple II and Apple III 
computers are similar in design, but dif- 
fer in their capabilities. The Apple II 
(shown in Fig. 1) is intended more for 
home use: the Apple III for business. 
Both systems store about I40K bytes 
(IK byte equals 1024 characters) of in- 
formation on 5!4-inch floppy disks. 
Both use a TV set or video monitor for 
color or black-and-white display. 

Both systems have full-size key- 
boards. The Apple II supports from 16 to 
48K bytes of memory, and the Apple HI 
supports up to 128K. The Apple W/also 
has a 10-key numeric pad. 

As business software-packages flour- 
ish, those computers are becoming in- 
creasingly recognized as suitable 
machines for business — as well as for 
home-use. 

Apple Computer, Inc., 10260 Bandley 
Dr., Cupertino, C A 95014. 

Atari: Atari manufactures two per- 
sona] computers: the mode! 400 and the 
mode! 800. The first has a memory 
capacity of 16K, a touch-switch key- 
board and RF output for use with a TV 




FIG. 1 



82 



set. It has excellent color graphics 
capability but is suited more for home 
use than for business. 

The model 800 supports up to 48K. of 
memory, has a full-size, typewriter- 
style keyboard and can be used with a 
TV set. Up to eight 514-inch disk drives, 
each capable of storing 163K, can be 
connected to the computer. Although 
originally designed for home use, the 
Atari 800 is beinning to find its way into 
the business world as well. 

Atari, Inc.. 1265 Borregas Ave.. 
Sunnyvale, CA 94086. 

Commodore: Commodore Interna- 
tional offers a wide range of computers. 
The company began by manufacturing 
calculators and then progressed into 
the personal-computer marketplace. Its 
newest computer is the VIC color com- 
puter. That system is a single unit with 
the keyboard/computer using a TV re- 
ceiver for display. 

The CBM 2001 and 8032 computers 
offer up to 32 K of memory with a 25- 
line by 40-column display available on 
the former and a 25-line by 80-column 
display on the latter. Both have built-in 
video monitors and full-sized key- 
boards with ten- key numeric pads. 

Commodore International, 950 Ri Hen- 
house Rd., Norristown. PA 19401, 

Radio Shack: The first mass-market 
microcomputer was this company's 
TRS-80 Model I. Since it was intro- 
duced, the TRS-80 family has grown to 
include four more models. 

The Model I is no longer in produc- 
tion. The Model H is a self-contained 
system with a full-size keyboard and 
numeric keypad. It can hold up to 64K 
of memory and comes with a built-in 8- 
inch disk drive. The integral video dis- 
play provides 24 lines of 80 columns. 

The Model HI also is an integrated 
unit, and is capable of running software 
written for the Model I. It features a 
full-sized keyboard with a 10-key 
numeric pad, a video-display screen, 
up to 48K of memory, and has provi- 
sion for two built-in 5!4-inch disk 
drives. 

The TRS-80 Color Computer is de- 
signed for direct connection to a TV re- 
ceiver and cassette recorder. Its fea- 
tures include color graphics, sound- 
generation capability and 4K of memory 
(expandable to I6K), For elaborate 
game playing, joysticks (control de- 
vices) can be added. 

The Pocket Computer is a calculator- 
size device with 1 .9K of memory and a 
24-character liquid-crystal display. A 
cassette interface for loading or storing 
programs is optional, and a small print- 
er is available. 

Other systems 

The list just presented is by no means 
exhaustive. Some other personal com- 
puter manufacturers whose products 
are well worth looking into are: Heath/ 



Zenith Data Systems, Ohio Scientific, 
North Star and — believe it or not — IBM. 

Shopping for a computer for your 
home or business need not be a grueling, 
frustrating task. If you do your home- 
work — know exactly what tasks you 
want your system to do, talk to other 
users and keep up by reading system 
reviews and evaluations — you will in- 
vest your time wisely and be in a good 
position to know which system will suit 
you best. 

Next month we'll take a look at com- 
puter software, discussing language op- 
tions, operating systems, and how to 
select the software best suited to your 
applications. R-E 







"I was a successful TV serviceman 
until mv mirror broke." 




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NETRONICS R&D LTD. *»*.. 

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For more details use free information card 
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SPEAKER, System 500, features a 1-inch 
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The soft-dome high-frequency driver 
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acoustical chamber that isolates the 
driver from the low-frequency system. 

The midrange driver is also acoustically 
isolated. The 5-inch molded cone with 
high-compliance vinyl surround is mounted 
in Jensen's tuned isolation chamber. The 
12-inch acoustic-suspension driver has a 
variable-density molded cone supported 
by a high-excursion polyurethane foam- 
surround for tight, accurate bass, even at 
high-power levels. The driver has a high- 
power epoxy-cored voice-coil assembly 
and a high-energy monolithic strontium- 
ferrite magnet. 

The System 500 features a wide-range 
control system with separate high-fre- 
quency and midrange controls. Each 
has a 10-dB range of adjustment. It is 
priced at $290.00. — Jensen Sound 
Laboratories, 4136 North United Parkway. 
Schiller Park. II 60176. 

MOTO-TOOL KIT, model 2501, contains a 
model 250 constant-speed (30,000 rpm) 
Moto-Tool with a 0.8-amp. 115-volt, 60- 
Hz AC series-wound motor, and 24 ac- 
cessories, all housed in a tough, light- 
weight, polyethylene storage/carrying 



case with a snap-lock cover. 

The model 250 with accessories gives 
the do-it-yourselfer, hobbyist, and model 
maker a high-speed, multi-use power 
tool for carving, cutting, drilling, polish- 
ing, grinding, sanding, sharpening, and 
much more. It has a shatterproof molded 
nylon housing and is shaped to be held 
comfortably in the hand while being used. 
The smooth-running 30,000 rpm motor is 
quiet and has lifetime-lubricated bronze 
sleeve bearings. A built-in hanger permits 
the user to hang the Moto-Tool near the 
work project when not put away in the 




CIRCLE 132 ON FREE INFORMATION CARD 

storage/carrying case. The Moto Tool is 
10 r A inches long and 6% inches in diam- 
eter. The unit comes with a 3- wire grounded 
cord. 

The price of the model 2501 Moto-Tool Kit 
is $54.95. — Dremef, Division of Emerson 
Electric Co., 4915 21st St.. P.O. Box 518. 
Racine, Wl 53406. 

DISPLAY MONITOR, model NDC-90, is a 
9-inch unit that provides high definition 
and reliable image presentation. The 
unique features of the display are a wide 
video bandwidth of 25 MHz; excellent 
linearity; uniform focus characteristics 
across the entire screen; a horizontal 
retrace time that is usually less than 7 
microseconds, and electrical and mech- 
anical compatibility with Ball Brothers 
and Motorola monitors. A specially de- 
signed PC board and electronics are 
incorporated in the monitor to achieve 
performance levels previously impossible 
with devices of this kind. Separate hori- 
zontal drive, vertical drive, and video- 
signal inputs, as welt as one for composite 
video, have made it possible to provide 



84 




CIRCLE 133 ON FREE INFORMATION CARD 

simple interface circuitry. 

The model NDC-90 has a minimum 
mean time between failures of 10,000 
hours with a 90 percent confidence 
level. The unit is delivered with P4 phos- 
phor as standard. (Available options are 
P31 and P39 phosphors, as well as a 
power-supply moduie that is compatible 
with nearly any standard power source 
used today.) 

The model NDC-90 is priced at $215.00. 
— TSD Display Products, Inc., 35 Orville 
Drive. Bohemia, NY 11716, 

CAR STEREO, model T691, features road- 
rated performance and a Powerplay 
amplifier for greater power and cleaner 
sound. The system also includes separate 
bass, treble, balance, and fader controls: 




CIRCUE 134 ON FREE INFORMATION CARD 

local/distant, mono/stereo, and FM mute 
pushbuttons; loudness control; automatic 
power antenna switching; dial-light 
dimming; line-level output jacks, and 
power-off eject. The model T691 is priced 
at $169,95. — Craig Corporation, 16 East 
52 Street, New York, NY 10022. 

COMPUTERIZED WEATHER STATION for 
households offers twelve functions plus 
memory, for use by homeowners, farmers, 
hobbyists, or anyone else interested in re- 
ceiving specific regional weather in- 
formation. 

The weather station is quite simple to 
install; cable and wall mountings are at- 
tached directly to the full-sized display 
panel which mounts on your wall. It dis- 
plays hour and date for high and low 
readings and its "smart" clock remem- 




bers how many days are in each month, 
so that no resetting is necessary. 

The digital display shows wind chill, 
rainfall, humidity, maximum and mini- 
mum temperature, time, degree days, 
heating and cooling, date, barometer, 
wind direction, and wind-speed readings. 
Readings are displayed in standard or 
metric scales, and knots or miles-per- 
hour for wind speed. The weather station 
operates on AC. with a battery pack that 
will hold all memories in case of power 
failure. It also includes for assembly: rain 
collector, temperature sensors with cable 
attached, display unit, mast-arm assembly 
with cable attached, and remote chassis 
with line cord. 

An automatic select button allows you 
to have the display hold each function for 
a four-second interval, and then move on 
to the next automatically. The Corn- 
puterized Weather Station is priced at 
$995,00, plus $15.00 for packing and 
guaranteed delivery. — Edmund Scienti- 
fic, 7082 Edscorp Building, Barrington, 
NJ 08007. 

DMM, model 461-2R, is a compact, hand- 
portable digital multimeter that reads true 
RMS on AC voltage and AC current 
ranges. The RMS-reading instrument has 
a high frequency-response — up to 50 kHz. 
It will respond to the RMS value of any 
wave shape, thus providing accurate 
measurements of noisy or complex AC- 
voltage waveforms. 

The model 461-2R meets UL-1244 re- 
quirements, and is UL-listed. It has a 
bright 0.3-inch. 3V2-digit LED display, 100- 
nV resolution, and 0.1% basic accuracy. 




CIRCLE 135 ON FREE INFORMATION CARD 



CIRCLE 136 ON FREE INFORMATION CARD 

Performance is assured by a 100% double 
burn-in and supported by a one-year fac- 
tory warranty, ft measures 2 x 5.6 x 4.6 
inches, weighs 1V2 pounds, and operates 
8-hours on a single charge of its batteries. 
It can be operated from AC while the bat- 
teries are being charged. There is also a 
full line of optional accessory probes that 
will expand the unit's capabilities. It 
comes with nickel-cadmium rechargeable 
batteries, an AC charger/adaptor, color- 
coded UL-approved test leads, and an in- 
struction manual. 

The model 461-2R carries a suggested 
retail price of $216.00. — Simpson Elec- 
tric Company, 853 Dundee Ave., Elgin. IL 
60120. 

TUNER, model NAT 301, is designed to 
provide the most listenable signal pos- 
sible. On both FM and AM (including in- 
ternational long wave), several self-ad- 
justing systems select the optimum re- 
ceiver bandwidth for the particular input 
signal automatically, taking into account 
interference from adjacent channels 
and the noise levels present, 
On AM, two separate receiver signals — 
continued em pMge 88 



WE TAKE 
YOU BY 
THE HAND! 

You'll learn all about computers: how 
to build, program, service, even pi ay TV 
games-without knowing the first thing 
about it! 




The New ELF II 
"Beginners" Package 

Your own expandable micro-computer 
kit, 5 diagnostic analyzers plus circuit, 
programming, diagnostic manuals, even 
games you can play on TV. All only 
SI 39.95. 

Even if you don' I know bits from bytes, now if 3 easy and 
inexpensive to build your own micro-computer, karri ho* it 
work 5. program it, service it-even play games with it on your 
TV! It's here in the New ELF II " Beginners" Package, on]y 
from Neuronics. Only SI 39.95. Here's the package: 1. your 
own micro-computer, the famous ELF [I (featuring the RCA 
1802 CMOS microprocessor) in kit form with step-by-step 
instructions on how to buitd it. Diagnostic Analysers including 
2. your own Logic Ptobe. 3. Pulse Catcher, 4. 8 bit Test 
Register, 5* Logic Analyzer, 6> Gate Arrays. 7. Non-TechnicaJ 
Manuals on how to use analyzers, how to get into the guts of the 
computer, what makes it tick, how to service it 8, Sample 
Programs that leach you machine Language programming plus 
how to correct or "debug" any programming mistakes, 9. TV 
games you can play. If your TV set has no video input, in 
optional converter (RF Modulator), is available, Then, once 
you've got this L Beginners" Package under your belt, keep on 
expanding your ELF II with additions like the Typewriter Key 
Board, added RAM, Full Basic Interpreter, Electric Mouth 
Talking Board, Color/Music, A/D-D/A Boards For Robot 
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with the New ELF 11 "Beginners 1 ' Package. Only Si 19.95. 
Mail or phone in your order today and begin. 

SfrteineiiiHu: ELF II "Btxiiw*" F'i: k.5: 

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HK bytai with DMA. hk mipt, 1 1 A(|f lUn, ALU. 2S4 byu HAM u-ptndrth u> 
HK ^i>i* i Prat* j i kj*iiI- Ht n luybovd, fully dteootd Httara'irtonHdlowuU 

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f if c-j nry foi H4d u liunaviry «m of thf RCA 1 &02' i * totoi Ikhm. Th* diifrtotoc 
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Continemal US. A Credit Card Buyers Outside Connecticut 

CALL TOLL FREE 800-243-7428 

To Order From Con ntciicu 1 or For Tech n ical Assistance, Etc., 

Call (203) 354-9375 
NETRONICS R&D LTD. ^» 

333 Litchfield Road, New Milford, CT 06776 
Please send the stems checked btlow; 

ELF !1 "Beginners" Kit S 1 39.95 



O RF Modulator . 



. S 8.93 



Plus S3. 00 Tor postage, handling and insurance 
IS6.Q0 Canada) 

Connecticut Residents add sales tax 

Total Enclosed S 

□ Personal Check '.. Cashier's Check/Money Order 

□ Viia O Master Charge (Bank No, ) 

Acct. No, . 

Signature Exp. Date 

Print 

Name 

Address 

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HITACHI SCOPE 
SALE CONTINUED BY 
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YOUR 
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IANNEL SCOPE 
MULTIPLEXER, DM-12 

Conven yo c r 5 -ngi* channel scope mle a * a r B eh j^nel in ss^gmenl ius1 to i nc d 
the D M - 1 2. 8 Chi r nci SCOOf muhi pleaer to yeu I scope . cllpltlBfl input protMS (0 
trie signal! you warn la view Simple, easy. I«t — tin handle IPQlc level TTL 
signals Tram 00 to 3MH.' Features separate spacing and [race ampl lode con- 
Irois em) selectable sampling rile — ae lo insure easy dear scope display. 

Complelely 

Assembled and 
tested! Ready 
to use! 




— 6 TTL compatible input channels jl TTL load per 
channell on dnve 50 Ohm scope able 

— Maximum full screen amplitude t .6 Volts adjusta- 
ble 

— Trace amplitude and spacing centre's. 

— 4 or & channel selector switch. 

— 8 color coded input cable, 24' long wrth Insulated 
alligator dips. 

— CltermU 9 HOC pew supply included [Model 
MMFtC-2). 

— BHC Output Cable Actessory (Mocdt PS*-! add 
114.95 




VIEW 6 

CHANNELS 
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63 



oo 



LOW COST CAPACITANCE 
METER MODULE, DM-8 

Conned this It igh quality low cost Capacitance Meter Module, DM- 
8 to your drrjilal Volt Meter 2nd mm it into a Digital Capacitance Me- 
tir— theLowCoslWay! 



MLfliaULCEirDQ.es 



— Push to itai rir.p* <6urton| from IpF io 
M.OOQLiF C 

— IVO cali&ritirj* control J 

— Irene easy to uu . self- cc n Ian eo cac njgc ^ 

— &miry powtrwi.. Willi "pmh to Tud" Jit- 
tery sivflr circuit 19V batlcnflj not in- 
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Completely 
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tO U5D 1 



63 



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REGULATED TRIPLE POWER 
SUPPLY, LOW PRICED!, DM -6 

A rgiiy H»mblfd and lesled pflwer supply till! provides* solid. 1ul iy -wired inpHr 
power supply inducing fiao 5V jB 1 Amp . 5V tu 1 SV ft a ,5 Amo . ana - 5v lo 
- 15V iij D 5 Amp — ill supplies reauliled. short pro si Each supply his short 
Inrjicjidr LED. Complete *nd .-tidy for yttmj durable (&" i 6" x 3 WTJ mstal 

CMS 





YEAR 
F ^WARI 




» cur 

Display irei 
ikKejlEralansoltntui 
Ctiltnuty mea jUvon 



Senvttwty t.nd butdwfltn- 

fl« f.me 
Dynamic r j -.; * 

InpmRandC 

HH. rnurrnfip'jlvcUrjB 

Display mgd* 

X-Yoptriiien 

■ He mrtii a*r«non 

Swvf p mod* 
Tvvinxnro«mir>i 

harm" 

^cterni! 



1SG6UB31 (5-iftth r DU US amp* i 

AilDdtf Mdrf.SSnrimf 
App.'OI 2KV 
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inV.'dv 5Vd-- : V. DC 15MMJ JUS 
imVCv 1V fl/. :6'i DC SMHjTyp -34 
fUS-rirj i5 jrip'l fn 
Mftt 

Maftih»Pi«'e-JiiisHhlr 



DirKllHfjnm appro* 30pF 
wtrVt ■ p or 3«rY i DC - AC peaii 
CW CH2. DUAL. ADD. DIFF 
DC- 500 HHr. 5rTVd.y ■ 5V d-v 
Pti lie fl-liefinc! DC - IflfcHi 3" 

Auta3.H0flM,TVI *J TV[-I 

TV lirDC-HpirKH CltCUr. 
Drfr 1 '9*r [Y iyiG-j fftUf 
Chtr IVp-p- |V ljr,M^'iji| 



2DH1-2MHJ 



OSdlar 

l 50-* 



HJftnY 
(OOtiV 



voitiot 
■ Power rtqinnmnli 
> Dimtrvwii 



OJ^^rr-DUdw-SV IS 

lQtimHUTVr 

ICkViidv 

lUtt z 1D". iyp &guin «M 

JV i 3% 

■ «■'-■ ■" l IQ 2 ZO 24 S> v 1 ■ -. ' G- : ■» 

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A0OTOC 2?ShV! x iM-.Hi > <iX>lD"nni 

AppraM ? $:-3 

a- -«"c 



MODEL V-152B 
WITH 2 YEAR MFG. WARRANTY 



95 



644 



WITH FREE DM-12 

8 CHANNEL MULTIPLEXER 

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AT LIST OF $804.95 

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Tit * 1 1 Moflt CM' Jl D cj : H j" Friqi*iC|f CiHiriWr n iuy1o ,i 
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— 5 HJ Tfl 550 HHj 

— t big iisy-lD-reM 43' ntah "iti-mily LED dtipiiy 

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riur j to tiErictiirf tilt 

COMPLETELY 
ASSEMBLED 
PRE-CALIBRATED 
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FREQUENCY METER MODULE 
"5Hz to 100MHz", DM-11 




Ua?uun; lr«jin-cEi Ircrn SUr tr> IDOWrtl on y<9ur d<p''JI wnmtler ff ,n 4 itWuiiiW- Ol 3 1? 
d>g>i;. — eiit to uh — - periidi Iv l^d «rv>« — <jib- ceitmg — 10™ tab-byii 1 Conntct lip 
DM- 1 1 la yaur DVM . UE lit DVM to Lie ZVOC nrtflt, connKt 1 liji J' ID the DM-1 1 VH I tWC 
ubie (nr/i included] md meHure <»« Irequencr or my iou;« Hi Lo Rjrurjf LED 1 iiurt Use 
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wttiuw 



63 1 



FREE 1981 
SALE FLYER 
NOW BEING 
MAILED! SEND FOR 
YOUR COPY TODAY! 

II lor any reason, whatsoever, you are not completely salished wilh 
your purchase, return it within SO days ol purchase dale lor 3 full 
rotund — it's as simple as that! Shipping S Handling charges not 
rstu ridable 



ALBIA SATISFACTION WARRANTY: 
FOR FAST AND DEPENDABLE DELIVERY SERVICE 
CALLTOLL FREE: 1-800-243-6953 



IN tr. AK b HI CALL 
COLLECT |2LB) .67-5590 



9 A.M. to 
5 P.M. E.S.T. 



WE ACCEPT MASTER CHARGE. VISA AND AMEX CREDIT CARDS 

Connecticut Residents add 7'tfli Sales Tax • Prices shown in U.S currency only Foreign orders add 15". 

ALBIA ELECTRONICS INC 

44 KENDALL ST. • P.O. BOX 1833 • NEW HAVEN, CT. 06508 



POSTAGE A HAN DUNS 


ORDERS 


ADD 


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Design 
Albia Mate™ 
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)M-5 

STOCK NO. 
4-0555 



58 



— Control switches and buffered 
LED logic indicators 

— Plug your ICs into solderiess 
breadboards, tie in power and 
ground, connect your logic 

switches and LED indicators 
— FAST, EASY TO USE! 

— All Interconnections between 
LEDs, switches and circuits via 
22-26 solid wire 



— Self-powered, in one compact, 
good looking and durable 
carrying case 

— Ideal for home experiments, 
the laboratory and students 

— Battery (4 1*A VoltC cells') or 
AC powered providing eco- 
nomical bench use or conven- 
ient portable use 

'Batteries not included 



NOT A KIT! DM5-B POWER SUPPLY ADAPTER ACCESSORY $18.50 

Design Mate™ 2 Low Cost Function 

Generator DM-2 is a 3-waveform function 
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DM-9 Logic Probe 

ALBIA'S ECONOMY DIGITAL 
DM-9 MULTI-LOGIC 

COMPATIBLE 5-1 5VOC PROBE 

The features are many on this quality Albia 
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detect low rep. rate 
pulses (up to 1.5 
MHz); detects low, 
high or pulsed logic 
levels with a mini- 
mum detectable 
pulse width of 
300 nsec. 
Easy-to- 

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readout. Built- ^^W / IMU I 

in over-Voltage m A 

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Model 
No. DM-9 
Stock No. 
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i8S;.' POWER 
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SPECIFICATIONS 

IK POT IMPEDANCE 300 000 
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thresholds (HI-LEOI TON Vcc 
Logic thresholds (LO-LEQ) 30% Vcc MIH DE- 
TEETAILE POLSE WIDTH 300 nanoseconds 
MAX IK PUT SICNAL fREOUEKCr 1 5 MHi PULSE 
DETECTOR (PULSE LED) High SpeM pulse ran or 
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end pulse SI'tlChir KM. INPUT VOLTAOE • 50V 
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Model DM-13 Kit 

Hive fun building this uralm ki and uh manxy mi trie hitch tome. Slop 
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bitty assemble in at will ptowfli bw rything yau'11 pratabty need .1 your 
tM»fjsrtJps- 
- With tomplelB stet-by-step easy 13 understand asifmbty 'initrticliq«i- 



— All rtmtar* ara 1 1 Win. 

— SttKtuFief 

— 24 



[r)for*n» ±5^ 



DM-4 Multipurpose Pulse Generator 

The Design-Mate A may tie used as a dock source, delayed 
pulse generator, synchrono-us clock source, manual system 
stepper, pulse slreicher clock burst generator and in 
tandem with one or more DM-4's used to gate the output ol 
one or more additional DM-4's Tne .vide range of controls and 
functions will give you an 



39 



MODEL 

OM-13 

STOCK HO. 

15-0013 



00 



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SALE PRICES LIMITED TO ACTUAL 

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NO DEALER ORDERS PLEASEI 




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CIRCLE 66 ON FREE INFORMATION CARD 






w 



§ 

m 

CD 

m 
3) 

CO 
CO 



87 



NEW PRODUCTS 



continued from peine 85 



one wideband and one narrowband— are 
provided. The receiver selects the best 
mode of operation and then sends a sic 
nal to the external AM antenna box, 
tuning it for optimal reception at the de- 
sired frequency. The model NAT 301, po- 
tentially, can deliver AM sound to rival 
that from the FM section. 

On stereo FM, the receiver section 
maintains the optimum signal-to-noise 
ratio by reducing stereo separation 
gradually, and finally limiting the band- 
width of the tuner as required by the 
quality of the signal being received. 




CIRCLE 137 ON FREE INFORMATION CARD 

The digital display brightens when the 
receiver finds the center frequency and 
locks on to the incoming signal. That 
visual feedback has the effect of teaching 
the user those frequencies that he or she 
uses most often. On FM, a sophisticated 
muting circuit is activated automatically 
until this center frequency is located, the 
receiver has found a listenable station, 
and the AFC has locked onto the signal. 




Similar muting takes place on AM; how- 
ever, the user may tune off the center fre- 
quency, shifting the signal into such a 
position that any beats or whistles caused 
by adjacent channels are eliminated. 

The model NAT 301 is priced at $3,500. 
— Nairn Audio, Ltd., (England); U.S. Dis- 
tributor: Audiophile Systems, Ltd., 6342 
Hawthorn Park Dr., Indianapolis, IN 46220. 

STATIC-ELECTRICITY ALARM, model 
WA-1, gives a visual and audible alarm 
when ambient static electricity reaches 
predetermined levels. 

Static electricity can ruin the micropro- 
cessors that are the basis of many new 
electronic products, and can be a safety 
problem in many industries, such as ord- 
nance, chemical processing, and paper- 
making. It is also a peril in surgical op- 
erating rooms, and, because static elec- 
tricity can make a surface dust-attractive, 
it can cause serious quality-control prob- 
lems in such industries as graphic arts, 
photographic processing, and precision 
assembly. 




CIRCLE 138 ON FREE INFORMATION CARD 

A wire serves as the model WA-1's an- 
tenna. The sensitivity of the alarm is a 
function of the length of the wire, making 
it easily adjustable to the user's individual 
requirements. For example: An 18-inch 
wire will detect 240 volts at a distance of 
one foot. A three-position switch has 
settings for the red-light warning, the 
high-pitched alarm, or off. The unit 
measures 1 x 3.25 x 2 inches. 

The model WA-1 is priced at $69.96. — 
Wescorp, 1 155 Terra Bella Ave. Mountain 
View, CA 94043. 

POWER AMP. model MA5Q02A, is de- 
signed to provide instantaneous internal 
electronic compensation for intermittent 
or continuous 2-ohm operation, without 
actuating any of its protective circuitry 
and without current limiting. 

The model MA5002A is rated at 250 watts 
stereo at 8 ohms. 20 Hz-20 kHz with less 
than 0.09% THD; the same specs apply for 
375 watts-per-channel at 4 ohms. TIM Is 
less than 0,02%. slew rate greater than 50, 
IM less than 0.05% (typical 0.02%), and 
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Protective circuitry is four-way. Short- 
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The model 4380-488 is priced at 
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±3dB. 

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800 Hz, and 7 kHz. System and treble cir- 
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The Wharfedaie E-90 PRO carries a sug- 
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Rank Hi Fi, Inc., 260 North Route 303, 
WestNyack. NY 10994. 

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next command or data. It is compatible 
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NEW IDEAS 



Headlight Alarm 



HAVE YOU EVER FOUND YOUR CAR 

battery dead because you had left your 
headlights on after shutting off the 
engine and walking away? Before long 
your battery is totally drained, and you 
have to start looking for a passing good 
Samaritan or a service station. It is a 
frustrating experience, as you know if it 
has ever happened to you. 

This circuit is designed to give off an 
alarm anytime that the lights are on but 
the engine off. The device is easy to 
build and almost any technique can be 
used. Installation is also simple and just 
two connections to your car's electri- 
cal system, and one to its chassis, are 
required for proper operation. 

The circuit for the project is shown in 
Fig. I. An SPDT relay, RY1 (Radio 
Shack 275-003 or equivalent), and diode 
D2 (IN4004 or equivalent) supply power 
to the rest of the circuit only when the 
headlights are on and the ignition 
switch is off, A circuit made up of R7 
and Dl regulates the voltage to IC1. 
The IC is configured as an oscillator, 
and is used to supply pulses to Ql, 



which is used as a transistor switch. 
Each time a pulse from IC1 reaches it. 
Ql supplies power to TRl's driver cir- 
cuit (TR1 is a piezo-buzzer element. 
Radio Shack 273-064 or equivalent), 
sounding the alarm. 

The connections to your car are fairly 
straightforward. The lead marked to 
+ I2V lights should go to a line that 
carries + 12 volts whenever the head- 
lights are on (the one for the dashboard 
lights is a good choice). The lead labeled 
TO +I2V IGNITION should go to one of 
the lines that power the car's acces- 
sories (radio, cigarette lighter, etc.). 
Make those connections to any point 
that is easily accessible; typically that 
will be at your car's fuse box. The lead 
labeled TO GROUND can be made to any 
convenient point that's connected to 
the car's chassis. 

Of course there are times when you 
wish to use your headlights while the 
engine is off. All that needs to be done 
to silence the alarm in those instances is 
to turn the ignition switch to the ac- 
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R8 

4.1K 



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NEW IDEAS 

This column is devoted to new ideas, 
circuits, device applications, construc- 
tion techniques, helpful hints, etc. 

All published entries, upon publica- 
tion, will earn $25. In addition, Panavise 
will donate their model 324 Electronic 
Work Center, having a vatue of $49.95. 
It combines their circuit-board holder, 
tray base mount, and soider station (see 
photo below). Selections will be made at 
the sole discretion of the editorial staff 
of Radio-Electronics. 




I agree to the above terms, and grant 
Radio-Electronics Magazine the right 
to publish my idea and to subsequently 
republish my idea in collections or com- 
pilations of reprints of similar articles. I 
declare that the attached idea is my 
own original material and that its publi- 
cation does not violate any other copy- 
right. I also declare that this materia! 
had not been previously published. 



Title of Idea 



Signature 



Print Name 



Date 



Street 



City 



State 



ZIP 



Mail your idea along with this coupon 
to: New Ideas Radio-Electronics, 

200 Park Ave. South, 

New York, NY 10003 



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SERVICE CLINIC 



A closer look at high-voltage shutdown circuits 

JACK DARR, SERVICE EDITOR 



I'VE NOTICED SOME NEW TV CIRCUITS IN 

the last year or so. Actually, they aren't 
really new— they just do things a little 
differently! When activated, they cause 
the picture to flicker on and off at regu- 
lar intervals, or cause the sound to go 
"putt, putt" (like a motorboat). I've 
gotten quite a few letters from confused 
technicians who were facing those 
symptoms for the first time. 

The cause of ail that activity is quite 
simple — it's the high-voltage shutdown 
circuit in operation! I first ran into that 
type of circuit while going through an 
Admiral Service Newsletter (looking 
for something else, of course). The 
shutdown circuit in the Admiral 4K10/ 
4MI0 chassis (and others) causes the 
raster to flash on and off about once a 
second, while the sound makes a 
"tweet" at the same rate. 

What happens here is that if an arc, 
or anything else, trips the shutdown, 
the circuit tries to reset itself after 
about a second. If the fault was mo- 
mentary, the set will come on again and 
work properly. If the fault is still there, 
the circuit will shut down the set again 
{and again, etc.). 



Any of the usual problems will cause 
the shutdown circuit to trigger. Run the 
regular series of tests to find the specific 
cause. Start with the DC voltage: Plug 
the set into a variable-output trans- 
former and turn the line voltage down. 
Monitor the regulated B+ and bring the 
line voltage up until the B+ is at the 
correct value. If the set now works, 
check the regulator; if it doesn't, look 
elsewhere. 

The same type of shutdown circuit is 
used in other sets; among them are 
those in the new Magnavox I3C2 
power-supply series. Although the 
shutdown circuit in the Magnavox sets 
is different from the one in the Admiral, 
it works in pretty much the same way, 
only faster. 

The heart of that shutdown circuit is 
op-amp "Z" in IC322, located on supply 
module 704191 ; the op-amp is shown in 
Fig. I. The output from the op-amp 
goes, via diode Dl. to the duty-cycle 
modulator of the switching regulator 
(Fig. 2). As long as everything in the set 
is normal, the output of the op-amp is 
high. The slow-start circuit shown in 
Fig. 1 delays set turn-on and high- volt- 



age buildup. When the set is turned on, 
there's an instant when the + I2-volt 
supply is low. If it is below +8 volts, a 
control transistor, TS2, is off, and TS3 
conducts. That causes capacitor C330 
to be charged, pulling the output of op- 
amp Z low. That, in turn, pulls the out- 
put level of the sawtooth oscillator (see 
Fig. 2) so low that the duty-cycle 
modulator is cut off, shuting down the 
set.- When the supply voltage rises 
above +8 volts, the opposite takes 
place; the transistors turn the op-amp 
off, causing its output to go high. When 
that happens, the duty-cycle modulator 
works again. 

That is what happens during shut- 
down. There are, of course, other situa- 
tions that can trigger the circuit including 
low B+, high B+, and excessive cur- 
rent drain. In every case, the output of 
op-amp Z goes low, cutting everything 
off. 

All of the voltages monitored are 
found on supply module 704191. The 
DC voltage developed from the AC tine 
comes from rectifier module 704192. 
The horizontal oscillator drives both 
the switching-mode regulator and the 




92 



horizontal-output tube, so they are 
always in syne. The operating DC volt- 
ages come from the flyback. The 
switching-mode transformer drives the 
horizontal output transistor, which in 
turn drives the flyback. 

For troubleshooting, the + 129-volt 
DC supply is the key. Full the hori- 
zontal-yoke plug: that disconnects the 
horizontal-output circuit. Now check 
the + 129-volt DC supply. If it is OK, 
check the horizontal-output circuitry, 
the horizontal-output transistor, and all 
of the low- voltage rectifier diodes 
coming from the flyback. If the + 129- 
volt DC supply is puslating. or too high 
or low. try a new supply module. 

If you'd like more information on 
how the Magnavox shutdown circuit 
works, refer to the July and October ' 
1980 issues of the Magnavox Service 
News. R-E 

SERVICE 
QUESTIONS 

CAPACITOR SUBSTITUTES 

Bill Stiles, CET, of Hillsboro, MO 
has sent in some information on using 
Sprague polypropylene capacitors as 
substitutes for others. A Sprague PPI6- 
S 18 is a substitute for a Zenith 22^001 , 
a ,0018 nF capacitor rated at 1600 
volts. A PP16-S1 IS is a substitute for a 
Zenith four-legged capacitor. That 
capacitor comes with a data sheet that 
says that it is an exact replacement for 
two Zenith, and one Admiral, part 
numbers. 

Fuji-Svea, Inc. lists an assortment of 
Sprague capacitors, assortment num- 
ber KF-34, as Sprague series 715P 
(note that all of the individual part 
numbers start with PP). Those capaci- 
tors are exact replacements for poly- 
carbonate-film capacitors in critical 
commutating and S-shaping circuits, 
with high AC-current carrying-ability. 
The kit includes 18 different values, 
including 1.75 n¥ at 100 volts (a yoke- 
return capacitor), and others at ratings 
of 600. 800, 1200. and 1600 volts. The 
last two ratings are for ,0033-jiF and 
.0039-^F capacitors. 

Thanks Bill; this is information that 
I've been trying to get for quite some 
lime. 

SMEARY PICTURE 

The picture on this Quasar TS-938 was 
very smeary. The focus control worked 
normally, but did not help the problem. 
The picture tube heater-i/oitage was low; 
replacing the J A panel (flyback power- 
supply} helped, but not enough. The 
sharpness Is still below normal. Any 
ideas?— G.S., Red Bank, NJ 

Trying inputing a color-bar signal. 



and checking it with an oscilloscope al! 
the way from the video detector on 
through the video stages. If you have a 
three-bar function on your bar/dot 
generator, it will give you three nice 
square-wave signals. 

Look for a point where the signal is 
sharp at the input of the stage, but dis- 
torted (rounded corners, slanted, etc) at 
the output. When you find that stage, 
check the DC voltages and so on. One 
common cause of this problem is a 
leaky transistor: try a new one. 

(Feedback: "Thanks! You hit it! The 
1st video transistor was leaky. I re- 
placed it and now the picture is 3O09£ 
better."} 



TRIPLER TROUBLES 
I've got a problem with an RCA CTC92K, 
It came in dead — bad tripler, bad output 
transistor, and an open fusible resistor. I 
replaced all of those and got sound, but 
no raster. The high voltage and raster 
voltages out of the tripler are all OK. I 
have no screen voltage on the picture 
tube; that comes from a tap on the tripler. 
Alt of the series resistances check out. 
Any ideas would be appreciated. — L.C., 
Sacramento, CA 

Well, you may have one of two prob- 
lems. Either the wrong tripler, without 
the screen tap. or an open circuit be- 
tween the tap and the screen controls, I 
was going to tell you to bridge the 




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I N TE H N ATIDN Al_ I NC 



215.000-ohm fusible resistor in the cir- 
cuit, but you've already done that. 
There is another resistor in that circuit. 
100,000 ohms, and it has a habit of 
opening up under load. If you are getting 
high voltage and focus voltages, but no 
screen voltages at all. even right at the 
tap of the tripler. that almost has to be 
the wrong tripler! 

NO BOOST VOLTAGE 

The problem is no high voltage in this 
Magnavox T-960. The boost voltage is 
only about +260 volts instead of +540 
volts. Also I get just -23 volts on the grid of 
the 38HK7. Everything else checks out, 
but I must be missing something. — ST., 
Delta, IA 

Well, you do have a little boost volt- 
age; the 260-volt B+ means that the 
stage is trying to work. What you're 
overlooking is the very low voltage on 
the grid of the 38HK7. That voltage 
should be -42 volts, and since it is de- 
veloped by the drive signal from the 
horizontal oscillator, that drive is 
probably very low (it is normally 140 
volts peak-to-peak). Try a new 6GH8 
in the oscillator stage, and check all of 
the DC voltages. 

THIN VERTICAL LINE 

Here's some feedback on the GE 
10JA chassis. The symptom was a thin, 
fuzzy, vertical line on the right side of 
the screen. But before I got your re- 
sponse. I found the cause. Replacing 
the horizontal driver transformer 
cleared up the problem. 

Thanks to Danny Davis. Moundville. 
AL, for that helpful information. 

DOUBLE PICTURE 
I've got two complete pictures side-by' 
side on this Zenith 19DC22. All of the 
tubes and transistors check out OK. Can 
you help?— J. W., Lafayette, LA 

That sounds like an old Zenith prob- 
lem. The horizontal -hold control is a 
tunable coil. The coil has a stop, but if 
the control knob is pulled out a little 
too much, the stop can be missed. If 
that happens it is possible to turn the 
knob too far — far enough, in fact, to 
make the oscillator run at half speed, 
7875 Hz. Turn the knob until the pic- 
ture returns to normal. From experience, 
you'll have to turn the knob counter- 
clockwise; turning it clockwise will in- 
crease the inductance, making the os- 
cillator run even slower. 

6HU8 TUBE 

Can you tell me where I can get a 6HUS 
tube, or a substitute tor it that I can use by 
rewiring the socket? I've looked every- 
where, but had no luck.—E.S. Cory don, IN 

You've opened up a real can of 
worms! I've looked everywhere and 
come up with what you did — nothing! I 
finally did run down something in an 



old RCA tube manual, a listing that 
read "6HU8/ELL80." The "ELL80" 
notation indicates that this is a European 
type with the "'PRO-Electron" num- 
bering. It is a dual power-output pen- 
tode with a 2-watt output, a 6.3-volt 
heater, and a 9-pin base. No substitutes 
are listed, but the load impedance is 
1 0.000 ohms. You should be able to 
find two common single-configuration 
miniature tubes with the same load 
impedance and run them side-by -side — 
any impedance from 8.000 to 10,000 
ohms should work. You'll have to do 
some juggling, and mount another 
socket, so be prepared for a lot of 
work. 

STEREO DISTORTION 
I've got a Sanyo DC434 stereo receiver 
with bad distortion. Everything seems to 
check out OK, but If I go back from the 
output and touch coupling capacitor 
C429, the distortion stops. I need help'.— 
A.C., Howard Beach, NY 

I think that you may have already 
found it. Chances are good that C429 is 
either leaky or opening up intermittently. 
That capacitor is a low-voltage electro- 
lytic, and I've grown to suspect them 
in any circuit with problems. Try a new 
one and see if that's the case here. 

LOW SOUND 
I've got a sound problem In this AMC 
5CP-301. I've tried a new speaker, changed 
both transistors, and changed the sound- 
IF iC with no luck. I get very little signal at 
the collector of Q301, the driver. Any 
ideas?— E.S., Zion, IL 

I don't think that you are really 
getting anything out of Q30I — just 
some signal leakage. This is a common- 
emitter stage: the emitter is bypassed. 
If the bypass is open, you'll lose pract- 
ically all of the gain. Use an oscillo- 
scope to check the collector, base, and 
emitter. If the signals on the base and 
emitter are nearly the same, the bypass 
is open. There should be no signal at all 
on Q30t 's emitter if the bypass is good. 

(Feedback: ""You hit the nail on the 
head. Capacitor C317, the .22 uF by- 
pass capacitor was open. I replaced it 
and the set now works fine.") 

HORIZONTAL-FREQUENCY 
PROBLEMS 

When this Sony KV-I5I1 was first 
turned on, the horizontal frequency 
was completely out of the range of the 
horizontal-hold control. After 5 to 10 
minutes, the frequency drifted back 
slowly and would lock in at the end of 
the control's range. Thinking that the 
component's value had changed and that 
heat was partially correcting the prob- 
lem, I tried cooling spray; it had no 
effect. Voltages seemed to be close 
enough to what they should be. and 
didn't drift during warm-up. 



94 



In this set. the frequency is controlled 
by a DC voltage. The horizontal-hold 
control sets the DC-voltage level that 
biases the AFC. An oscilloscope 
showed horizontal pulses across that 
control. I traced the pulse back to the 
B + line, and finally to C533. a 100 fif 
filter capacitor. Replacing the capaci- 
tor fixed the problem. 

Thanks for this to Vic Spacek of 
Bioomfteld. CI 

VIDEOTAPE COLOR 

I wrote you about a problem in a 
Sony videotape recorder. It would play 
back previously-recorded material in 
perfect color, but would not record in 
color. Although you said that you 
didn't know anything about that ma- 
chine, you did suggest a few things to 
try. including cleaning the record/play- 
back switch's contacts. After finding 
the thing (the switch on this unit works 
through a series of levers; the contacts 
themselves are on one of the circuit 
boards), I cleaned the contacts with a 
spray cleaner. The videotape recorder 
now works perfectly. 1 just thought that 
you'd like to know. 

— Lloyd Htisi. Brigham City. UT 

TWO HINTS 

Here are a couple of hints for your 
files. The first deals with the vertical- 
output fuse in the Zenith 23FC45 that 
keeps failing. The only way to repair 
that problem is to replace the vertical- 
driver transistor (the one with the TO- 
126 flat-pack case). The transistor 
seems prone to failure under load. The 
problem is intermittent, and heating or 
freezing does not reveal it. 

The second hint involves the Zenith 
25CC50 and similar chassis. The 
symptom is poor focus even if the focus 
voltage is normal. Even though the 
CRT will test out as good (at least on 
my testers) the CRT must be replaced 
anyway. That has shown up recently on 
25VACxx and 23VAQ CRT's. R-E 



EQUIPMENT REPORTS 



ontinucit on page 36 



wide and I could not get quite enough 
heat from the de soldering gun. Holding 
the tip of a second soldering iron to the 
other side of the lug melted the solder, 
and the Hot Vac did the rest. 

The desoldering system is a well- 
made piece of equipment; I've used 
Ungar products for many years, and 
I've liked them. The instructions are 
very complete, and include a parts list, 
service information, and clear illustra- 
tions. The mode} 4000 Hot Vac is priced 
at $399.00, There is also the model 
4O00E for 220-volt operation that sells 
for $555.55. R-E 



The TSE-HARDSIDE 
1982 Micro-Computer 
Buyer's Guide 

is now available! We've included 
such valuable information as print 
samples from each of the printers 
we carry, feature-by-feature 
comparisons of micro-computer 
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complete product descriptions. 
We're making this valuable 
reference available for only $2.95 
(credited toward first purchase from 
TSE-HARDSIDE). Just clip the 
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check for $2.95 to the address 
below. THE TSE-HARDSIDE 1982 
BUYER'S GUIDE will soon arrive 
postpaid to your door. 

Yes! Send me the 
TSE-HARDSIDE 
1982 Micro-Computer 
Buyer's Guide. 

I've enclosed $2.95 Please send only your FREE Price List 
Name, 




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Dept. C, 14 South Street 
Milford, NH 03055 



I Address. 

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the original micro-synthesizer 

Every day more people discover that PA I As 
GNOME is the most versatile, coat effective 
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(S69.95 plus S2.00 postagel 

I I Srnd FREE CATALOG fiA '_ 



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zip. 



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For more details use free information card inside back cover. 



REPLACEMENT BATTERY BROCHURE 
is an illustrated 8-sheet foldout showing 
and describing all the batteries presently 
offered by Gould. The clearly-printed, 
easy-to-read chart gives needed informa- 
tion on volts/ampere hour capacity, 
Gould part numbers, maximum battery 
dimensions, battery description, and 
typical application. There is also a brief 
instruction on how to make the best use 
of the brochure. Free upon request— Avex 
Electronics Corp., 121 Coulter Avenue, 
Ardmore, PA 19003. 
CIRCLE 1 1 1 ON FREE INFORMATION CARD 

ELECTRONIC HARDWARE CATALOG, 

two-color, 44 pages, 8V2 x 11 inches, 
combines previous catalogs and includes 
many newly-released products. It con- 
tains complete specifications and order- 
ing information on a full range of DIP. 
transistor and IC sockets; adaptor plugs 
and covers; cable sockets, plugs and 
jumpers, and the industry's most com- 
prehensive line of strip-connector prod- 



ucts. The latter include socket and ter- 
minal strips ("snap strips") and cable- 
strip connectors. Free upon request. 
— Samtec, Inc., 810 Progress Blvd., PO 
Box 1147. New Albany, IN 47150. 
CIRCLE 112 ON FREE INFORMATION CARD 

COLOR BROCHURE, Land Mobile Radios 
and Accessories, is 12 pages, S'/j x 11 
inches, and describes a broad line of two- 
way business radios, pagers, repeaters, 
and accessories in layman's language. 

Rugged, slimly styled dash-mount mo- 
bile radios are available with up to four 
channels in power ranges from 20 to 75 
watts. The trunk-mount radios feature a 
two-channel, mini-control head and 
transceiver capable of being mounted in 
any convenient place in the vehicle-trunk, 
under a seat, or under the dash. 

Handheld UHF radios have a transmit- 
ter output of 3.5 watts, and VHF models 
have a full 5-watt capability. All models 
have six-channel capacity and weigh less 
than two pounds. Several models are 



rated intrinsically safe. 

Pocket pagers are available in VHF and 
UHF models. All are rated intrinsically 
safe. Repeaters, designed to extend busi- 
ness-radio signals over greater distances, 
are available in both VHF and UHF 
models. 

A complete line of accessories, includ- 
ing antennas, power supplies, external 
loudspeakers, microphones, crystals, 
tone devices, batteries, and chargers 
support the two-way radio line. Free upon 
request. — Standard Communications 
Corp., PO Box 92151, Los Angeles. CA 
90009, 

CIRCLE 113 ON FREE INFORMATION CARD 

RADIO-PRODUCTS CATALOG is 40 

pages, 2-color, 5Vi x 8V2 inches, and fea- 
tures a new 5-channel. 10-watt VHF FM 
transceiver; new COR and CWID modules 
for repeater builders, and new accessories, 
such as RF-tight enclosures for repeaters 
and power supplies. Also featured are the 
new T51 (VHF) and T451 (UHF) FM exciter 





















SSP 



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SHEET METAL WORKERS 



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available as accessories 

Specif 

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and receive a FREE 
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• continuous shearing » c _ 50 

• corner notching 558 

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• nibbling shipping 



- Send lor your FREE literature and 
SHEET METALWORKER BULLETIN 

PACIFIC ONE CORPORATION 

410 W. Pacific Coast Hwy Suite K1Q7 
Newport Beach, CA 92663 (714) 645-5962 



CIRCLE 53 ON FREE INFORMATION CARD 



Put Professional Knowledge and a 

COLLEGE DEGREE 

in your Electronics Career through 



HOME 



STUDY 




Earn Your 

DEGREE 

No commuting to class. Study at your 
own pace, while continuing your present 
job. Learn from easy-to-understand les- 
sons, with help from your home-study 
instructors whenever you need it. 

In the Grantham electronics program, 
you first earn your A.S.E.T. degree, and 
then your B.S.E.T. These degrees arear> 
credited by the Accrediting Commission 
of the National Home Study Council. 

Our free bulletin gives full details of 
the home-study program, the degrees 
awarded, and the requirements for each 
degree. Write for Bulletin R-8L 
Grantham College of Engineering 
2500 So. LaCienega Blvd. 

Los Angeles, Caiifornia 90034 



modules. Many new ranges of transmitting 
and receiving converters have been 
added, as well as a series of receiving 
converters to extend the frequency 
coverage of scanners to new military, 
satellite, and commercial bands. The 
catalog also includes the full line of Cush- 
craft and Larsen VHF/UHF antennas. Free 
upon request. — Hamtrortics, Inc., 65F 
Moul Rd„ Hilton, NY 14468. 
CIRCLE 114 ON FREE INFORMATION CARD 

THERMISTOR BULLETIN, 5-pages, 8'A x 
11 inches, is a "technical data" bulletin 
which provides information relating to 
the testing of thermistors and includes 
material such as: RT testing: resistance 
measurement; temperature control; un- 
balanced thermocouple voltage-error; 
self-heating errors: determining bridge- 
supply voltage; accuracy of measure- 
ment, and other associated topics. Free 
upon request— Fenwal Electronics, 63 
Fountain Street, PO Box 585, Framing- 
ham, MA 01701. 
CIRCLE 115 ON FREE INFORMATION CARD 

DIGITAL INSTRUMENTATION CATALOG, 
is a 2-color, 16-page reference brochure, 
8Vi x 1 1 inches, describing a broad range 
of digital instrumentation. Included are: 
5'/a-digit and 4'/2-digit multimeters; 4Vj- 
digit portable/bench DMM's; 3Vj-digrt 
hand-held portable DMM's; DC voltage/ 
current standards; analog multiplexer; 
488 interface: frequency counters; capa- 
citance meter, and thermometer. A com- 
plete range of options and accessories is 
also included. Free upon request. — Data 



Precision Corporation, Electronics 
Avenue, Danvers, MA 01923. 

CIRCLE 116 ON FREE INFORMATION CARD 

THIS MONTH, 32 pages. 8Vi x 11 inches, 
is an illustrated catalog of electronics 
equipment. A recent issue features audio- 
visual materials, compressors, fans/ 
blowers, lenses, CCTV, magnets and acces- 
sories, motors and accessories, power sup- 
plies, pumps and compressors, relays, sole- 
noids, tools. TV/CCTV equipment, valves 
and gauges video-tape, and innumerable 
other items. Free upon request. — Herbach 
& Rademan, Inc., 401 East Erie Avenue, 
Philadelphia, PA 19134. 
CIRCLE 117 ON FREE INFORMATION CARD 

TERMINAL BLOCK CATALOG, 32 pages, 
8V2 x 11 inches, describes both lines of 
RDI back-barrier series and JB series 
open-barrier terminal blocks. Full and 
complete dimensional drawings, tabular 
matter, and engineering specifications 
are given. 

All four rating/sizes RDI back-barrier 
series are described fully, including the 
miniature No. 3 series (5 amps) the No 4 
series (10 amps), the univeral No 6 series 
(20 amps, 300 volts), and the heavy-duty 
No. 8 series (25 amps). All are available 
with vertical and right-angle PC pin termi- 
nals, solder-turret, wire-wrap, quick-con- 
nect, and surface mount. Standard screws 
are the wire-clamp type designed to elimi- 
nate the need for crimp-on terminals, etc. 

The open-barrier JB series is available 
in 20-amp. 300- and 600-volt models. PC 
pins, surface mount, and insulated and 



non-insulated feed-through solder-turret, 
quick-connect, and wire-wrap terminal 
styles are featured Standard screws are 
the binder-head type with wire-clamp 
style offered as an option. 

All RDI terminal blocks feature break- 
resistant thermoplastic barriers, wire- 
ready screws (screws are in the raised 
position), and standoffs for full flux clean- 
ing. Free upon request. — RDI/ Reed De- 
vices Inc., 525 Randy Road. Carol Stream. 
IL 60187. 

CIRCLE 118 ON FREE INFORMATION CARD 

COLOR-CODE CHART, Is single-sheet, 
8V2 x 11 inches, in full color, on stiff 
coated paper. Designed to aid specifica- 
tion of fixed composition and metal film 
resistors, the chart includes all standard 
MIL and EIA resistance and tolerance 
values, with ordering information. Free 
upon request. — Stackpole Components 
Company, PO Box 14466, Raleigh, NC 
27620. 
CIRCLE 119 ON FREE INFORMATION CARD 

ELECTRONICS CATALOG, 142 pages, 5Vi 
< SVt inches, is fully illustrated and lists a 
wide variety of equipment, including test 
instruments, digital portable multimeters, 
tool kits, soldering stations, outlets and 
outlet strips, tubes, antennas, assorted 
components, TV accessories, kits, micro- 
phones, TV games, personal computers, 
auto accessories, and video connectors 
and cables. Free upon request.— Ford ham 
Radio, 855 Conklin Street, Farmingdale. 
NY 11735. R-E 

CIRCLE 120 ON FREE INFORMATION CARD 




ORGAN 

AND 

PIANO 

KITS 

The most advanced — most versatile 
electronic instruments in the indust- 
ry are now within most everyone's 
reach .... because you build them 
yourself the easy and very exclusive 
WE RSI way. Best of all, you'll save 
up to two-thirds the cost of a comm- 
ercially built instrument. 

With WERSl's unique "Building 
Block" system, you actually select 
features you desire. Incorporate new 
features as they're developed. No 
need to trade organs again. 

Send for free literature on this excit- 
ing concept today. {Please specify 
Piano or Organ) to: 

Dept.M21, P.O. Box 5318 
Lancaster, PA 17601 




ER 

HYBRID 

AMPLIFIER 
MODULES 

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30 
watts 

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HY2M [120 watt* RMS) 79.95 

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GL3DSTOHE Electronics 

901 Fuhrmann Blvd., Phone Orders 

Buffalo, New York, 14203. (716) 949-0735 

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Pleas* send 

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Number Exp I 

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_Zip_ 



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'"jpppkz computer 

(Mnplirt Hicrtproctiitri Imi etnptiirlll 4 Ttrmruli 

APPlf MRUS Disk 130K DOS 3.3 

48K si.'iSIJO w/contrcfer $575.00 

LANG SYS SOROCIQ135 795 00 

W. PASCAL 395 00 TI-99/4 399.00 

Green Monitor 174 00 Epson MX-80 callus 

LeeOB* 100 Mon 139 00 Color Monitor . . call us 

I0S44SG call in TWO $1395.00 

Ti-745 1140 01) 50 Column Board .299.00 

TexQS Instruments 

invest Anal 5 42 00 W ' S175 00 

Accessories .. Call us m III bin 39 95 

TI-58C SO 00 MM Speak & Spell 49 95 

PC100C 155O0f~f HPiogiammet 47 95 

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SCM TYPEWRITER SPECIALS 

SCM 2200 $279 00 INTREPID , , 1274.00 

SCM 2600 269 00 CLASSIC 12 .159.00 

All units shipped in original cartons with accessories 
accortling to manulactuiw's specification Send money 
orders, personal check 2 weeks to clear In Illinois add 6% 
sales tin Add S6 95 minimum shipping S dandling crtarges 
pec unit We ship UPS Subrtci to availability Written 
warranty lor specific products can be obtained free upon 
request Above prices are tor mail order and prepaid only. 
Prices and specifications sublet lo change wrthoul notice 
Send mailorders. 

Hagiki. 9/tc. 

S19 OHVIS E'.ANSTON II L 60201 TEl 31MSS-S144 



97 



NEW BOOKS 



For more details use free information card inside back cover. 



THE HOME VIDEO HANDBOOK, Second 
Edition, by Charles Bensinger. Video-Info 
Publications, PO box 1507, Santa Bar- 
bara, CA 93102. 304pp.; 5% x 8'A inches; 

so ft cover. S8.95. 

This is much more than a second print- 
ing of the popular first edition; there are 
100 additional pages and 80 new photo- 
graphs and graphics. The aim of this sec- 
ond edition, however, remains the same 
as that of the first: It is designed to un- 
scramble the confusing data and claims 
surrounding home-video equipment and 
to provide clear and visual explanations 
of technical jargon and popular video sys- 
tems. 

There is a detailed treatment of popular 
home color cameras, video cassette re- 
corders, videodisc systems, large-screen 
TV projectors, home-satellite TV receivers, 
and VHnch industrial-video systems. 

The reader is instructed not only in how 
to purchase the best equipment for his or 
her own needs, and how to obtain the 
most satisfactory results from it, but also 



how one's video equipment can be used 
to pay for itself, create new opportunities 
for personal employment, or perform 
community educational and information 
services. 

Photographs, drawings, and cartoons 
illustrate the easy-to-read text: there is a 
list of home-program sources, educa- 
tional sources, and popular video books, 
as well as an 11-page glossary of tech- 
nical terms and a list of manufacturers' 
addresses. 
CIRCLE 121 ON FREE INFORMATION CARD 

HOW TO REPAIR CB RADIOS, by Law- 
rence E. Schultz. Gregg/McGraw-Hill, 
1221 Avenue of the Americas, New York, 
NY 10020. 184pp.; 5% x 8 inches; soft- 
cover. S9.95. 

This book is written from a service 
technician's point of view and uses a 
hands-on approach. Theory is dealt with 
only when the material is peculiar to CB 
radios and the reader needs it as a sup- 
port to trouble-shooting techniques. 



None of the techniques and hints in the 
book are theoretical, however: They have 
all been tested and proved effective on 
the service bench. 

The introduction describes the many 
types of CB radios and their accessories. 
Then we get into basic troubleshooting 
techniques. Chapters 3 to 8 cover "De- 
veloping Signal Frequencies," "The Re- 
ceiver," "The Transmitter," "Power Sup- 
plies," "Antennas and Transmission 
Lines," and "Single-Sideband Circuitry." 
The book is fully illustrated with photo- 
graphs, diagrams, tables, and charts. 
CIRCLE 122 ON FREE INFORMATION CARD 

MICROCOMPUTERS FOR EXTERNAL 
CONTROL DEVICES, by James A. Gup- 
ton, Jr. dilithium Press, P.O. Box 606, 
Beaverton, OR 97075. 279pp., Including 
appendices and index; 5V 2 x 8v:> Inches; 
softcover. $13,95 

This book deals with the ways in which 
a microcomputer can be used to control de- 
vices in one's home, one's business, or 



CREATE ANY 
RHYTHM "- 



' DRUM SET 



\cEJimi 



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ngnature Versatile memory organization 
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Bridges aie activated Irom either irie control 
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SWLs! Now copy 1 

RTTY, ASCII 

and Morse! 




Why just copy voice transmis- 
sions when you can easily decode 
radioteletype, ASCII computer 
language and Morse code with a 
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Easy, one-wire connection to any 
receiver is all it takes to open up 
many new frequencies to you and 
get you copying all sorts of coded 
transmissions, including nam con- 
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reports , and weather information. 

The Mini-Reader operates on 
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write for more information. 

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[Lawrence, Kansas 66044 

CIRCLE 79 ON FREE INFORMATION CARD 




Saving gas in 1968- 

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saved $ then and are 

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Tiger 
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Grand Junction, CO 61501 



CIRCLE 81 ON FREE INFORMATION CARD 



elsewhere. Many manual functions that 
are frequently subject to human error can 
be accomplished faster, with greater 
accuracy, greater repeatability, and lower 
cost through a computer. 

After an introduction to data acquisi- 
tion and conversion, and a discussion of 
the principles involved, the reader is in- 
troduced to remote control, micro- 
processors, and one-IC microcomputers, 
then shown how the microcomputer is 
used as a programmable controller. 

The reader will learn about computer 
systems for automating his or her home, 
microcomputer-controlled robots, and 
the use of robots in emergency situations, 
among other operations and processes. 
There are many photographs and dia- 
grams, glossaries, and review questions 
at the end of each chapter. 
CIRCLE 123 ON FREE INFORMATION CARD 

30 PROJECTS TO IMPROVE YOUR 
STEREO SYSTEM, by David B. Weems. 
Tab Books, Inc., Blue Ridge Summit, PA 
17214. 240pp., including appendices and 
index; 5 x 8Vi inches; softcover. S7.95. 

While almost any system can be im- 
proved, there are two areas where small 
changes can pay big dividends in better 
sound: at the antenna and at the speaker. 
That is why there are more antenna and 
speaker- related projects in this book than 
any other kinds. Some improvements, 
while real enough, are very expensive. 
The projects outlined here have all been 
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A CONSUMER'S GUIDE TO PERSONAL 
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MOS MEMORIES 

MOS Static RAM's 

Pari No. Price 

2101-35 IK (256 * 4| 350N5 22 PIN 3 65 

71 02-25 IK rlK >. II 250NS 16 PIN 1 25 

62111-45 IK [256' x 41 45CNS IB PIN 3 65 

P211J.J5 IK1256 i 4I350NS IB PIN 2 9! 

71 HL Low Power 4K |1D24 x 41 3IX1NS 2 95 

2147 4K I4K x II 55NS 3 45 

7147 -t |4K ■ II ■-.>.•■ 9 95 

UARTs ' ' 5 

AY5 1013A 3.115 
40 Kftr Single 5V Supply 

IK CMOS RAM 

5101 IK (256 I 41 450NS 22 PIN Low Power 3.45 

4K CMOS RAM 

P6S04 4K(4K x 1I550NS IB PIN IIOMIrV 5 04 

P6514 4KI1K I 41450NS IS PIN 110MW s 64 

SHIFT REGISTERS 

ITOS) Oual 512 oil 2-88 

n06l simile 1024 b>l 2M 



3341APC FIFO 1 MHj 
3343PC 64 Sil 
3347PC 60 bll 

ECL RAM 
I&4IMDOHM2106 
256 x 1 bil fully decoded 15NS IB pin 

CLOCK CHIP 

MSMSS.32RS 

Microprocessor fleai-time Cloek/Calernlai 



4.46 
3.95 
3.45 



8035 CPU 
B039CPU 
,-t '..-..: .-.ft, 

bobscpu 

8155 
B212 
8214 
B216 
6224 
8226 
8228 
8251 
8263 
B255 
6257 
8259 
6279 
B74S 
8755 



74S26S 
74S1S8 
93427i82Sl29 

9341 7.82S 136 

93446/7621 

9343617630 

9345317643 

9344817641 

9345H62S1B1 

62518577128 

74S17&J7132 

B3S19II713S 



7-25 
7.95 
1.95 
7.95 
BOO 
2.75 
4 25 
1.98 
3.44 
2.34 
4.97 
5.95 
9.95 
5.95 
9.95 
9.95 
10.95 
30.00 
32.00 



PROM'S 

Mt 256 

1.11 256 

2.75 1K 

2.75 IK 

4.S5 2K. 

4.95 2K. 

6.95 4K, 

7.S5 4K 

17.95 4K, 

17.95 9K 

19.B4 BK 

78.00 16K 



6600 CPU 

5402 CPU 

6806 CPU 

6909 CPU 

6810 

6320 

6821 

6645 

6850 

6852 

6502 CPU 

6504 CPU 

6505 CPU 
6520 
6522 
6532 
8551 



5,85 
065 
6.45 

19.95 
2 65 
2.65 
2.65 

29.50 
2.95 
3.65 

7.45 
7.65 
7.65 
5,95 
7.95 
1085 
11.10 



EPROM'S 

C1702A2K 1US 
02701 1 K « B 450 nj 
C2716V1MS2516 lintel .»■:.. on) 

I6K450NS SloflleSV Supply 

1MS2532it I Pi" O... li 

32K 14096 t SI 450 ns 

C2732 (Intel version) 

32K (4096 r. 81 450 ns 

TMS2564 

64K (BK x 8] 450 ns 



I 795 
1 4.75 
1 6.98 

91675 




1 6K STATIC MM 

TMM2016 3 16KI2K i 



I30QNS1 916.45 
II I3O0NSI 



Oil 16 PIN 
tal, 16 PIN 
16 PIN 
16 PIN 
16 PIN 
16 PIN 
18 PIN 
24 PIN 
24 PIN 
18 PIN 
24 PIN 
24 PIN 



16K MOS DYNAMIC RAMS 116 PINI 



11620(20ONSl 
4ll600O00WS)Ceramic 
4K MOS DYNAMIC RAM's 
TMS4060-30 

4K [4K I 11 300NS 22 PIN 
16K CMOS STATIC HAM 
61 16 16K [2K x 81 150NS 16 PIN 
64K MOS DYNAMIC RAM 
4l64 64Kl64Kx1|200NS 16 PIN 
4164 64Hl64Kxlll50NS 16 PIN 



t 2.91 
I 2.45 



12400 

52995 



SINGLE BOARD COMPUTERS 

ROCKWELL AIM 65 

R6502 based microcomputer system wiin loll si?*d keyboard. Alphanumeric 20 cnaraclar 
display and alphanumeric 20 column tnermal punter IK RAM Pnce 53426,00 
SVNERTEK SYM 1 

Power1ul65028.bn microprocessor 6 digil HEX LED display. Single 5V power reqijiremem 
Price: 5239.0] 



LINEAR IC'S 



EXAR PRODUCTS 



LM30tAN£ 


.32 


5N76477NF 


1.69 


LM747CN 14 


HI 


.M307NS 


.43 


LM346N14 


.99 


LM746CN8 


48 


-M30SN 8 


.59 


LM358N B 


.46 


LM1458NS 


.36 


.M308CH 


,95 


LM555N 3 


.28 


LM1468N-14 


S4 


_h4309K 


1.56 


LW556N 14 


.52 


LM1489N 14 


.54 


.M310HC 


199 


LM587CN8 


B9 


LM1495CN14 2.10 


-M311CH 


,85 


LM709CH 


59 


ILM1496CN.14 1.38 


.M3HN8 


.49 


LM7I4CH 


2.95 


LM2211CN.11 2 95 


.M31BN8 


1,19 


LM723CM 


.76 


LM2210PC 


1 nn 


.M316CH 


1.67 


LM723CN 14 


.45 


LM30BIDC 


1 67 


-M323B 


534 


LM725CN8 


1.22 


LM3403N14 


1.19 


.M324N 


.48 


LH733CN 14 


1.36 


LM3524PC 


artn 


-M33SN 


.48 


LM739CNI4 


1.09 


LM3SO0N 


98 


18T26N 


1.29 


LM741CH 


.59 


LM4136N 14 


M 


N8T28N 


4.38 


LM741CN B 


.28 


ULN2003AN 


79 



f 



PH*SE.!.OCKED LOOPS 

KflllOCP 'iK M.-jch,i*irjt 0#.-i j^.'ii^t 
KAHtC* ~< i ^^'^v--x.i^»l*iliM>-nJi, 

HmttLTZr ».*.' kAewya-ir^ Tor- 0K«4*> 

fllNCTIOHOEMEMTOfl 

ItUoiCp* ltgivj,iy Wii*lDrn- C*->— ll -- 
KHUOKP Vt h-.>.|ti< Fu-rLr*j" U*wm 

sntxTC vwi-sji -r.oni"tfnrt o>- iim^ 

KPIZ3C4C' »iK-vm QvHIHo' 
HHHJKP JHrt W irijl^ri--" Cur*. Hf 

I'lMiNC, CIHCUITfr 
■T*L M4C* Wti tTEO"*! 1 1 if-kmj Croat 

•iflLMMCiP ?-*M<^«ita>+>|T*ew^ir r 4-;^l 
XHHKPI Q**l 1 ^w OtVM 

K miI*3CW i ontj Ijih Trn_f 



WULTIPL1EB5 >nd MODULATORS 

lrUQtCI' w^,. r — tr-i^etr XX 

QTCrUTIOHAL Auntntm 

SKtBKf irVr^irr^iM+iaviKiOe;. *nr J* 

WVHM tllr.IV EUS 

XtOXTTQP iHHjhVi^»«)ei'Ps|i[0.-ipit>n-,*- U 

HMH11KP iTesjiwtHiisMEi^iH^Elri!*' H 

SOCIAL FUNCTIONS 



OPTOELECTRONICS 



SCR'S and TRIAC'S 



TRANSISTORS 



VLEOS 
LEO 20St T I 3mm R*d 

LED 211 T l3jT.mGTShen 
LED2T2T I 3mm Yflllo* 

LEO 220 T ■ 3 fl J -.nnr ?■!,-.;■! 

LED 222 T 1 3r* 5mm Grman 
LED 224 T 13^-1 5mm Yrl low 



to 

19 



.24 
16 



DISPLAYS 

FND35? 3?& CQmfrin'lCiil^Ode '-13 

FNDSOO 500 '' Common Caltodr W 

PND5O7S0O Ccmn-icin Anr-ijr *9 

OLHH 2955 

4 fhg* 1Fj mrTMiK iktrununHirc di.pUY 16 W 

ISOLATORS 

ILD74I DinilOplr, |-,ulfl[yr IPjOOV 
I L074 OuAd Oplo Ewl a lor 1 SO0V 
ILCT6 DualOptolsO'rilOr 1500V 
MCT2 Oplo Couple* 1500V 
TIL111 Oplo Coupler 1 50JJ v 
4N2B Oplo IjoJatof 250QV 
4H3Z Opl&'soiamr 1500V 



C106D 
TIC44 
TIC47 

■■C^CB 

ncnuo 

TIC1I26D 
TIC216B 
TlC?l-5D 

iiC2?erj 

TIC236D 
tlC2*&D 



» sen 

X SCR 

5S SCR 

106 SCR 

LI* SCR 

1.11 SCR 



TriK 
Tri.i. 



& snp 400V TO 220 
OG mp 30V TO02 
06 amp 200V TQ92 
B ,.-l. 200V TO 220 
B amp 4TJOV TO 220 
12 amp 300V TO 220 
1? amp 40OV T&220 
G amp 20QV TO 220 
G *mp 4QOV TO 220 
8 *mp 400V TO 220 
12 amp 400V TO 220 
IG amp 4O0V TO 220 



BiFet OP AMPS 



K W j, 1 



1 45 

LVGO 

.29 

St 

69 



TLoaicP 

TIOG2CP 

TLO&tCN 
■i:ini.i' 
U-J.-li' I 1 
TL07*CN 
TL0G1CP 
TLOfl^CP 
TLDB4CN 
TL435CN 4*5 



110 

195 

54 



4: 



L 1 ?* Prmee 

Dual lvh f-". ■■ ■ 
0u4d Low P>tj*f* 
Low n&se 
nuai Lo* hfuiH 

Ouad Low N»S* 
J f Pi l"CM-.L 
Ouai: J Frr Inoui 
Ou*d J Fel Inpul 
Swilch vmi BBfl 2&m* 



7IP29A 


.3* TIP12I 


.64 2N 29054 


45 2N4125 


li 


TIP29B 


.43 TIP122 


.74 2N2907^ 


J5 2H4126 


10 


1IP29C 


<5 npus 


.74 2NX53 


J5 2N4101 


.15 


TIP30A 


J 5 rtpta 


A2 7N3055 


.67 2N4402 


19 


TIP30B 


49 TIP127 


M ZH3440 


65 2N4103 


15 


1IP30C 


.53 TIPI40 


1.54 2N3771 


1^0 7N441P 


16 


TIP3IA 


.« 7IP14I 


1.64 2N3772 


1,50 2N5097 


1* 


TIP3IB 


.48 TIP 142 


;.05 2713773 


2.25 JNiOOS 


.16 


TIP31C 


52 7IP145 


1,99 2N6133 


1.04 2N5172 


II 


TIP324 


.46 TIP146 


I.9S 2N6163 


1.39 2NS220 


17 


TIP32B 


50 TIP147 


S.45 2N6545 


4.7E 2N5221 


17 


TIP32C 


56 T1P2955 


.93 2N3439 


.76 2N5223 


17 


TIP41A 


K TIP3055 


.75 2N6059 


2.45 2N5226 


.17 


TIP4IB 


65 FT3055 


.64 2HJD9S 


1.45 2N5227 


17 


TIP41C 


.09 


2N6079 


3tJ2NM01 


17 


TIP424 


07 2N404A 


1 95 2743702 


15 2NSS00 


12 


TIP42B 


89 2N697 


,37 2N3704 


1E2N5551 


11 


TIP42C 


.74 2N7C6 


.29 2N3706 


.15 2N5570 


15 


TIP110 


58 2111613 


35 2N3710 


15 2N5771 


1* 


TIP1II 


M 2N1711 


.35 2N3904 


i2 L-ri'.,v.' 


17 


TIP112 


.7! 2NIS93 


.35 2N3906 


12 PN2222A 


18 


TIP1I5 


58 2N22224 


??1 :■!:>.? 


10 PN23B0A 


15 


TIP! 16 


64 2N2366V 


.25 2N4123 


15 PHS •-.'.■'• 


IS 


T1PI17 


75 2N2464 


JS 2M124 


.15 PN1565 


10 


TIP 120 


.79 









TTL — STANDARD, SCHOTTKY 
AND LOW POWER SCHOTTKY 



MOON 

7401 N 
7402N 
74OTN 
7404N 
7405N 
740GN 
7407N 
7408N 
7409N 
74 ION 
7412N 
74I3N 
7414N 
7416N 
7417N 
7420N 
7422N 
7423N 
7425 N 
7426N 
7427N 
7428N 
7430N 

M -'li 

7433N 

7437N 

743BN 

7440N 

7442N 

744SN 

7446N 

7447AN 

7450N 

715 IN 

7453N 

7454 N 

7472N 

7473N 

7474N 

7475N 

7476N 

74B3AN 

74&1AN 

74B5N 

74B6N 

7490AN 

7491 AN 

7492AN 

7493AN 

7194 AN 

7195AN 

7496N 

7497N 

741 DON 

74I04N 

74107AN 

74 1 TON 

74 1 ION 

74 1 1 1 N 

741 IBN 

74120N 

74121N 

74I22N 

74123N 

74I25N 

74126ftN 

7412BN 

74132N 

74I36N 

74141N 

74I42N 

7414371 

74 1 44 N 

74145N 

74147M 

74KSN 

74150N 

7415IM 

74153N 

74154N 

74155N 

711 57N 

74159N 

74160N 

741BIAN 

74I62N 

74163AN 



23 :.."' :■, 

25 7H55M 

24 74 IC6N 
.24 74 1 TON 

26 74172N 
■26 71I73N 
.36 74 1 71.N 

36 74I75N 



26 
28 



42 



76N 

7i i ;bn 

25 74I79N 
47 71190N 
.42 74IJ2N 
" 74*84N 
74185N 
74190N 
7419IN 
.37 '-i.^ri 
.37 74193N 
.32 74 194 N 
.39 74195N 
.32 74196N 
,48 74'97N 
22 74196N 
.42 74I99N 
.42 74221 N 
74246N 
74247N 
.25 74251 N 
44 742594 
.95 74;-3N 
.84 r4370N 
.65 7427DN 
.26 74279N 
742S3N 
74293N 
74298N 
74351 N 
J4365AN 
74366N 
42 74367AN 
.42 74368AN 
.46 74390N 
t 36 74 393 N 

J» 74S00N 

47 ■■'' -.", 

74603N 

■i'r.-u 

74yMM 

71S08N 

.61 '1S09N 

.55 71 5 ION 

189 7i5nn 

156 74S15N 

61 71S20N 

.44 74S30N 

.44 74S32N 

.52 71S37N 

.72 71S5SN 

1,38 74E40N 

1.38 74S5IN 

46 74S74N 

54 71SS4N 

46 74S88N 

S2 74S112N 

.46 74SH4N 

.84 74S124N 

.45 74S132N 

.52 74S133N 

.84 74S134N 

3J7 74S135N 

3.79 71S138N 

3.79 74S139N 

,67 71S140N 

1 32 74S151N 

59 MSI53N 

1,H 74S157N 

.14 74SI5SN 

.30 74S161N 

74SI62N 

74SI63N 

J4S16SN 

74S169N 

74S171N 

74S175N 

74S1B1N 

74S1S2N 

74SIB9N 



36 
37 



211 
39 
29 

3* 
38 

36 



M 
H 



.52 
1 52 
.46 



.64 
.64 
67 

1.96 

4*5 

.79 

.60 

.58 

,77 

1.17 

1.M 

.75 

« 

2.39 

2.36 

.68 

C-5 

.66 

72 

.72 

.55 

79 

.72 

1J0 

1.55 

66 

1.44 

179 

.79 

189 

2.39 

1.19 

2.38 

59 

1.10 

.89 

.84 

220 

.11 

.69 

.58. 

.58 

.96 

1.29 



.59 
.« 

■". 
it 
89 
H 
1.17 
44 
.69 
■6 

1 1? 
7.1 

.78 
1.96 

2 IS 
l 71 

.98 

r; 

i ■:* 

96 
1 m 

65 
1.10 
1.10 
1 10 

-. 16 
(.T4 

;. -i. 

3^.4 
J 74 
S Vi 
1 M 
IM 
3"'i 
2.10 
MS 



74SI91N 1.68 

74SI95N 179 

74S2C1N 5.99 

74S22SN 5.99 

74S24.14 2.95 

74S241N 2.95 

74SJ41H 349 

74S25IN 1.49 

74S2t3N 2.29 

74S257N 1 42 

74S254H 1-09 

74S260N 1.69 

74S274N 17.99 

74S275N 16 77 

74S760N 2.29 

74E293N 3.39 

74$299N 6.S4 

74S373N 2 98 

74S174N 2 98 

74SJB1N 595 

74S41JN 2.9B 

74S47'N 6.45 

74S472N 8 45 

74S474N 9.55 

74S4 76N 5.95 

74 L SOON 19 

74LS01N 

74L502N 

74LS03N 

74L5WM 

74LS05N .22 

74LSOSN 31 

74LS09N J8 

74LS1DN 

74LS11N 

74LS12N 

74LS13N 

74LS14N 

74LS23N 

74LS21N 

741 S2I N 

74LS27H 

74LS30N 

74LS32N 

74LS37N 

74LS38N .29 

74LS42N 

74LS47N 

74LS46N 

74LSS1N 

74LS54N 

741 5! 5N 

7J t S73N 

74LS74N 

74LS7EN 

741S76N 

74LS7SN 

74LS85N 

74LSB5N 

74LSB6N 

74LS90N 

74LS91N 

74LS92N 

-4L$?3N 39 

74LS95N .48 

74LS96N .58 

74L5107N .42 



.22 
32 
32 



.22 
.28 
.21 
.29 
39 
32 
28 
39 
29 
.18 
29 
29 



.68 
99 

.21 
.24 
.21 
.32 
.32 
.36 

42 
.32 

69 
.84 

36 

3? 
.69 



.36 
H 



74Li 11 ■'. 
74LSI12N 
74LS122N 
74LS153N .59 
74LS125N .14 
74LS126N .44 
74LS132N .54 
74LS133N 1,66 
74LS136t; .42 
74LS138N .16 
74LS1MN 10 
T4LS145N !,09 
74LS147N 1.96 
74LS148N 1 43 
71LS1S1N -42 
71LS153N .42 
71LS155N XI 
74LS156N 99 
741SI57N .40 
741SI58N .46 
74LSI60N .69 



74LS161N 


74 


'4LS162N 


i in 


74L5163N 


58 


74LS164N 


<ji 


74LS16W 


89 


741516661 


• BJ 


ML J170N 


| 51 


74LSI73N 


.59 


74LS174N 


« 


74LS1 75N 


44 


71LS1B1N 


1 » 


141 518911 


MS 


71LS1SW 


72 


71L5191N 


71 


71LS192M 


si 


71LS193N 


64 


74LS194N 


61 


74LSi9SN 


86 


fii.5-n:-'i 


80 


71L5221N 


89 


71LS210N 


S5 


74L5241N 


89 


74LS242N 


1 in 


74LS243N 


i w 


74L5244N 


i in 


71LS245N 


1 ,5 


74LS247N 


84 


74LS248N 


i IN 


74L5249N 


1 10 


74LS251N 


54 


74LS263N 


•4 


71LS257N 


89 


74L5258N 


•-■-, 


74lSJ59N 


i 21 


74LS260N 


1 26 


74L5?66N 


36 


74L527JN 


1.19 


74LS27^N 


UK 


MLS279N 


46 


74 f S2&nN 


116 


74LS283N 


71 


■ ■.■■'::* ' 


73 


74LS293N 


.44 


74LS256H 


RB 


7JLS2?9N 


2 56 


74LS320N 


: 7s 


74LS321N 


i" 


WLS322N 


.1 gs 


74t$323N 


-41 


74LS324N 


325 


74LS348N 


2.65 


74LS3i2N 


1 (^ 


74LS353N 


i 66 


74LS362N 


MS 


'41S365N 


12 


74LG3MN 


.62 


71L5367N 


57 


74L536aN 


.52 


71LS373N 


i 2d 


74L5371N 


i 75 


7JiS3."-'i 


64 


-.- ■-••, 


1 26 


riLSaTBK 


..i 


74LS379N 


' 89 


■:.■=- ■ N 


H 


MLS39.1N 


W 


'.n<i39'.n 


119 


74LS447N 


37 


74LS490N 


I 59 


74LS630N 85.00 


74LS659N 


64 


74LS670N 


' 6J 



| TTL DATA 
I BOOK WITH 

■ SUPPLFWEHT 
J-Thf CDiTiplTtfl 

■ Book ufl TTL 
' Inc ludhrtg L. 
I IS. H.S..-nn 

I A L S Vtriiuiix. 

|PirtiNo. 

|Lc.cA112/*1t3 

S8.50 



CMOS 



C04M1BE 


33. 


CO4O40B, 


64 


Ct)4lMB6 


165 


CD4&o?ar 


\% 


CDiDJlB-E 


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CO4510BE 


« 


C&4O06M 


» 


:04042B1 


54 


C04iltBf 


59 


CDiM^BF 


24 


CO*G43BE 


54 


CD4LV12BE 


72 


CD40MBJ 


*r 


.: -*.•-..::;£ 


^2 


COilSufSt 


t» 


10400991 


M 


COa^SBE 


Tt 


CD45tSfl£ 


145 


CD401QB1 


n 




72 


Ct>45i4>B£ 


75 


UD4011Bt 


J2 


CO4043BE 


31 


CD45i9Bt 


52 


CD*0l2BE 


11 


C04t»M 


32 


Cr-iiJOBE 


H 


CD4013BE 


33 


CD4051BC 


.75 


C04"i??Bii 


,76 


CD'OufiE 


$6 


CD40E2BE 


-Tt 


LXMSSliBI 


1.2$ 


■"■M(- "jDE 


H 


CD 4053 P( 


79 


CD4577BE 


155 


CD401QBE 


-33 


Ct>lO60B£ 


H 


C04528BT 


72 


CD-SQITOE 


54 


GD4KG&C 


54 


I D4S31B1 


64 


C04CH8BE 


S3 


CD^WflBE 


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cd*s3:be 


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CD45418E 


144 


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cd^?:be 


71 


CtM072BI 


19 


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v 


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11 


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21 


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CD4024BE. 


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25 


CD4M.BI 


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CD402-J.BF 


£Q 


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59 


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C£J4P?5flf 


145 


CO4078B! 


36 


C0Jbi14flE 


.42 


CD402TBE 


42 


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CD45B5BE 


.79 


CD4074BE 


.54 


CD4i5ft?BE 


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47 


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72 


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72 


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117 


CD4093flE 


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120 


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1-75 


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MAIL ORDERS SHOULD BE SENT TO: 

U S A 133 Flandeis Road. Westboro. Massachusetts. 01561 
Telephone orders ft inquiries (617) 366-0500 

CANADA & FOREIGN 237 Hymus Blvd. Poiftie-Claife. (IVlII ). Quebec. Canada H9R-5C7 
Foreign customers please remit payment on an international bank draft or inter- 
national postal money order payable m US dollars. 
Prices are in US dollars Minimum order $10.00 
Add S3 00 to cover postage & handling VISA AND MASTERCARD ACCEPTED. 



CIRCLE 85 ON FREE INFORMATION CARD 




Fall & Winter '81 - TEST EQUIPMENT 

Electronic Component 

Cat lloU FREE 160 Page Book 



We carry the Following: 

TEST EQUIPMENT 

• B * K 

• LEADER 

■ VIZ 

• BECKMAN 

• HITACHI 

• GLOBAL SPECIALTIES 

• DATA PRECISION 

■ HICKOK 

ELECTRONIC COMPONENTS 

t JAPANESE I MOTOROLA Traninloii 
IC >. PET. Diodes 

• Capacitors 

• Rfttlttori 

■ Connectors, Cablet 

TOOLS 

• Wellef. Unflar Xceilite Veco. ate 




• Over 10 million components in stock to serve you 

• Over 20,000 sq. ft. of warehouse in the East & West 
. NO MINIMUM ORDER! 




C\/F A^ CALL TOLL FREE 
"JVWT 8Q0-421-2B41 



P.O. Sox 40325 Cincinnati OH 45240 

n«pt. Radlo-Etftctronlca 

. Phone_ 



Local: 513-373-0220 
Ttlei: 182 392 



.Z'P. 



CIRCLE 44 ON FREE INFORMATION CARD 




4%. Components Express, Inc. 

"Have unit k,***.i»ti vn\tt mrrtrmitxt toha/u3 



Have you A.ssetf your computer lately'*' 



1380 E Edmgei 



BROAD BAND MICROWAVE 

RECEIVER SYSTEM 

1.8GHZ to 2.4 GHZ 



only 

$295. 




PM 



/&na 



ALARM 




With built-in-converter to channel 
2, 3, or 4 of any standard TV set. 



• 750 Ohm to 

300 Ohm Adapter 

• 60 Fesl Coax Cable 
with Connectors 

• 3 Feel Coax Cable 
with Connectors 



RANGE 
SCOPE: 



24" Olsb 

Feed-Horn Receiver 
Mounilnfl Bracket 
Mourning Clamp 
Instruction! 

300 Ohm lo 75 Ohm 

Adapter 

Line pf sight to 250 miles 

Will receive within the frequency band from satelltes, 

primary microwave stations, and repeater microwave 

booster stations. 
CONTENTS: Completely packaged in 19"*19"x4 1/2" corrugated 

carton complete with list. 
WARRANTY; 

180 days for all factory defects and electronic failures for normal 
useage and handling. Defective sub assemblies win be replaced with 
new or re-manufactured sub assembly on a 48 hour exchange 
guarantee. 

This system is not a kit and requires no additional devices or 

equipment other than a TV set to place in operation. 

Denier inquiries inuiied- 



CIRCLE 16 ON FREE INFORMATION CARD 



SATELLITE TV 

• SYSTEMS • COMPONENTS • LNA's • 
• ANTENNAS • RECEIVERS • 

WE CAN HELP YOUI 

HIGH FRONTIER 

2230 E. Indian School Rd , Phoenix, AZ S5016 

(602)954-6008 



¥ 



£}Tci i ixc wieir\Mi 

SATELLITE VISION! 

Wff hihnj ine fiifln-sai ip«c 3 miiir home iirin mmuon <n th* 
wo/la tmfay *1dB gshn <nto-nn.il IncrudM rKatv.tr. INA 
L mpcJiHatiari AH prorwi lortilly angirnje-rcd TorTpp 
quality 1 CflmplBtBly wAi'lnleed' Im media He 
dflliwyl Complaia detlilt including uiallite 
TV infQi-maHorv. (immg nrvice, ip*ct. & di»< 
count icriedlule Sirtd$1 25 (or pgiEagtA 
ntrnJlmrj to / c.: 

TIGER TENrJ AS • * 

P O S«k 5fl1 
CasMiberry Florid* 35707 




• THE SYSTEM 20 • 

MICROWAVE TV RECEPTION 
AT rrS BEST!! 

• RX-2300 Assembled Down Converter 

• Power Supply t Antenna Switch 

• 25" Paranoic Antenna MM « 

• Ml Casual Cables 

• FHjII Vear Warranty 



TEM 



$5.00 shipping 

MiaiffMEfttflUTIM 

22519 *97th Avenue North 
Corcoran. Minnesota 55374. 




CMPUTER MARKET CENTER 



i 



COMPUTER MARKET CENTER ADVERTISING RATES 1" by 1 column (1 5/8") $55.00. 1 1/2" by 1 column 
(1 5/8") $82,50. T by 1 column (1 5/8") $110.00. All ads must be prepaid. Send order and remittances to Com- 
puter Market Center, Radio-Electronics Magazine, 200 Park Avenue South. New York, New York. 10003. 
Address telephone inquiries to 212-777-6400. Frequency rates are available. 



TEXAS 





USED COMPUTER TERMINALS. 








PRINTERS, MODEMS, SUR- 




RETAILERS 




PLUS ELECTRONIC PARTS. 








CATALOG $1.00 








RONDURE COMPANY 




An ad for your computer 




THE COMPUTER ROOM 




store in this space in 




2522 BUTLER STREET 
DALLAS, TEXAS 7S23S 
(214)630-4621 




Radio-Electronics COM- 
PUTER MARKET CEN- 


8 






TER puts you in touch 






with our computer audi- 


o 




ence. They use micro- 


I— 




computer equipment for 


tt 




both business and 


—I 
W 

t 


Thanks bo you. flKSsS&k 

ilrmnrl-T Ifit'rV'l 


hobby interests. For 
further details call 212- 


D 


For all or U5. aaaaBN>^ 


777-6400. 


I 


United Way 







BUY THIS SPACE 

$55.00 puts your ad in tflis 
space in front of 197.223 active 
Radio- Electronics readers. To 
place your ad write Computer 
Market Center, Radio-Elec- 
tronics, 200 Park Avenue 
South. New York. New York 
10003 or call 212-777-6400. 



SUPPORT 

MARCH 
OF DIMES 



<§> 



► 



MASSACHUSETTS 




.jaa^aiO^TT, 



THIS 

is only one 
of hundreds 
ol unusual 
values , . . 



Get your 

FREE 

CATALOG 



Radio Shack's 
Modal HI 16K- W5S 

TOLL FREE 
1-800-343-81 Z* ,0(1 ^ ! 

Opt R 

24 5A Great Road 

Lii Melon. MA 
01480 



1-ouu-jtJ-o hi 

computer 
r plus 



Take stock in America, 
Buy US- Savings Bonds. 



104 



electronic components 



Belmont, California 94002 



I listing of over 600 items available 
from 600 authorized Jim-pak Distributors: 



fflfflf! 



TTL 

2/.S5 



. 2/.8S 
. 2/.S5 
.2/1.19 
.2/1.15 
. 2/.S9 
, 2/ .85 
.99 



MM 
7402 
7404 
7406 
7407 
740$ 
7410 
7414 

7417 2/1.10 

7420 2/.S5 

7447 1.19 

7474 69 

7475 , 79 

7476 69 

7485 1.19 

7486 2/1.19 

7469 2.99 



L 

7490 , 
7493 . 


i^Wf 


.35 
.85 


74100. 
74109. 
74121. 
74123. 




.2,25 

2/1.19 

.59 

.99 


74150. 
74154. 




.1,95 
.1.95 


74157. 




.99 


74161. 
74164. 




.1.19 
.1.59 


74174 . 




.1.59 


74175. 
74192. 
74193. 




.1.49 
.1.19 
.1.19 


74367. 
74393. 




.99 
.1.95 



POTENTIOMETERS 



-i 



2 Watt @ 70-C 

7(W Slotted Shaft 

Linear Taper 

1K, BK, 1DK. 26K, 60K. 

iOOK. 1 Mag 

CMU $2.95 



f^gjgm 



3/4 Watt @ 70*C 

15 Turn Pot. 

Linear Taper 

100 Ohm. 500 Ohm, 

IK. 6K. 10K. B0K. 

100K, 500K, 1M«g 

830P $1.79 



MSN 373 

Multi-Digit LED Display 
Digit Size: .3 No Decimal 
Com. Cath. 2-digit direct drive 
.80"L x .80"H x .225"D 
NSN373 (2perpkg.) 14 digits) $1.95 




4M» . . . 

4001 .. . 

4002 . . . 
4006 ., . 

4009 .. . 

4010 . . . 

4011 . . . 
4013 .. , 

4016 . . . 

4017 . . . 

4018 , . . 
4020 .. . 

4023 .. . 

4024 . . . 
4027 .. . 



CMOS 

,65 4030 



.55 

.59 

1,49 

.79 

,79 

.55 

.79 

.79 

1,39 

1.39 

1.39 

,49 

1.19 

.79 



4040 
4044 
4046 
4047 
4049 
4050 
4051 
4066 
4069 
4070 
4071 
4081 
4093 
4511 



.75 

1.79 

1.39 

1.95 

2.75 

.79 

.89 

1.59 

.95 

.69 

.75 

.69 

.59 

1.19 

1.95 



CONNECTORS 




DB25P O-Sutominlature Plug 3.95 

DB25S D-Subminiature Socket 4.95 

DB51226 Cover for DB25P/S 2.25 

22/44SE P.C. Edge 2.95 

UG88/U BNC Plug 2.19 

UG89/U BNC Jack 3.95 

UG175/U UHF Adapter .59 

S0239 UHF Pane) Recp, 1.49 

PL258 UHF Adapter 1.95 

PL259 UHF Plug 1.95 

UG260/U BNC Plug 2.39 

UG1094/U BNC Bulkhead Recp. 1.49 



( +Phone {fu nes 

REPLACES THE TELEPHONE RINGER BELL WITH 
A SELECTION OF 30 FAMILIAR TUNES 

ifW* ^^ m i — J i ^WF^ 

Telephone PT030 Wall Jack 

FEATURES 
Replaces monotonous telephone ringer bell. Easily connects 
to any standard phone. Use alongside regular phone or replace 
remote ringer elsewhere in building or outside. FCC approved. 
Use on any phone system — worldwide. Use different lune to 
identify extension phones. Microprocessor controlled. Ad|usl. 
vol. control and variable tune speed control. Operates on 2-9V 
batteries or AC Adapter (not i n c I . >. 

PT030 Phone Tunes $49.95 

AD30 AC Adapter S8.95 

jitflfc JE215 Adjustable 
^SpfTDual Power Supply 

General Description: The JE215 is a Dual Power 
Supply with independent adjustable positive and nega- 
tive output voltages. A separate adjustment for each 
of the supplies providesthe user unlimited applications 
for IC current voltage requirements. The supply can 
also be used as a general all-purpose variable power 

supply. FEATURES: 

• Adjustable regulated power supplies, 
pos. and neg. 1.2V DC to 15VDC. 

v " • Power Output {each supply); 

5VDC ® 500mA, lOVDCt? 7SOmA, 

12VDC© 500mA, and 
I k 15VDCS> 175mA. 

'jP'.J^ * • Two, 3-terminal adj. IC regulators 

with thermal overload protection. 

• Heat *ink regulator cooling 

• LEO "on" indicator 

• Printed Board Construction 
>"i • 120VAC input 

• Size: 3-1/2" w it 5-1/16"L x 2"H 

JE215 Adj. Dual Power Supply Kit (as shown). . $24.95 

(Pietura not shown but similar in construction to above) 
JE200 Reg. Power Supply Kit (5VDC, 1 amp) . . S14.95 
JE205 Adapter Brd. (to JE290li5.±9& ±12V. , SI 2.95 
JE210Var.Pwr.Sply. Kit, 5- tSVDC, to 1. Samp. . S19.9S 

DESK TOP ENCLOSURES 





DTE 8 (Pictured) $31.95 

DTE-11 (Pictured!.... 34.95 

DTE-14 (Pictured) 36,95 

DTE-HK (Case for JE600) 47.95 

DTE-AK (Case for JE610) 52.95 



JlMfe 



WP LINEAR flWF 



LM301N. . 

LM305H. 

LM307M. 

LM308N. 

LM309K. 

LM310N . 

LM311N. 

LM317T . 

LM318N . 

LM319N. 

LM320K-5 

LM7905T 

LM7912T 

LM791ST 

LM323K. 

LM324N. 

UM337T . 

LM339N. 



.59 
1.39 

.75 
1.19 
2.25 
2.69 
1.49 
2.29 
2.95 
2,95 
2.25 
1.75 
1,75 
1.75 
5.95 
1.29 
2.29 
1.29 



LM7MBT 
LM7812T 
LM7815T 
LM380N. 
LM3S4N. 
LM555N. 
LM556N. 
LM565N. 
LWI566N. 
LM567N. 
LM723N. 
LM741N. 
LM1310IM 
LM1458N 
LM14S8N 
LM1489N 
LM1800N 
76477N. . 



1.75 
1.75 
1.75 
1,49 
2,49 

.69 
1.49 
1.95 
1.95 
1.79 

.79 

.65 
2.95 

.99 
1.59 
1.59 
4.49 
3.95 



Sun Power Your Electronics! 
SOLAR CELL PANEL KIT 



ss 




x 



The J E305 Solar Cell Panel Kit contains 20 ea. solar ceils. On 
the panel board are power sine taps which allow the user to 
select voltages (1 voltage at a time) from 0.6V DC to 10VDC. 
The applications of each panel can be further expanded by 
coupling additional panels In series for more voltage or In 
parallel for more current. The premium grade solar cells pro- 
vide the current necessary for the operation of most portable 
transistor radios, small battery powered cassette tape 
players & unlimited experimental solar projects, 

JE305 $39.95 



• Output: 10VDC. to 100mA in Serins 

5VDC, to 200mA In Parallel 

• Panel may be easily connected tor 
Series or Parallel out 

• Over 11 square inches of active cell 
surface 

• Voltage line tap g 0.5V Increments 
■ Provision for charging batteries 

• Overall panel size: 
4>VL x 4'A"H it v,"D 



74LSOD. . 

74LS02. . 

74LS04. . 

74LS08. . 

74LS10. . 

74LS14. . 

74 L 530. . 

74LS32. . 

74LS3S. . 

74LS42. . 

74LS47. . 

74LS4S, . 

74LS73. . 

74LS74. . 

74L575. . 

74L585. , 

74LS90. . 



LS Schottky ffnff 



55 
55 
SS 
55 
55 
.09 
.55 
.69 
,69 
.M 
.29 
.79 
.75 

m 

.75 
.49 



74LS109 
74LS123 . 
74LS138 . 
74LS139 . 
74LS154 . 
74LS157 . 
ML516] . 
74LS174 . 
74LS17S . 
74LS192 . 
74L5193 . 
74LS221 . 
74LS244 . 
74LS245 . 
J4L5367 . 
74LS374 . 
81LS97. . 



. .75 
1.49 
1.29 
1.29 
1.95 
1.19 
1.29 
1.19 
1.19 
1.49 
1,49 
1.49 
1.89 
3.49 
.39 
1,95 
2.29 



SOCKETS 






Low Prof 

8 pin LP . 

14 pin LP . 
16 pin LP . 

15 pin LP . 
20 pin LP . 
22 pin LP. 
24 pin LP . 
28 pin LP . 
36 pin LP. 
40 pin LP . 



le Wire Wrap 

2/,59 14 pin WW tin .75 

2/,69 M pin WW gold 1,09 

2/.79 16 pin WW tin .79 

Z/.89 16 pin WW gold 1.19 

2/,99 24 pin WW gold 1.69 

2/1.09 40 pin WW sold 2.75 

.79 14 p. plug/cover 1,29 

.82 16 p. plug/cover 1.39 

.99 24 p. plug/cover 1.95 

1.19 Also, The MolexLine 



DIODES & TRANSISTORS 



IN751 . 
IN757 . 
IN1188. 

IN36O0. 
1N4001. 
IN40O4. 
IN4007. 
IN4148. 
IN4733. 
IN4734. 
IN473S. 
IN4742. 
IN4744. 



. 2/ 

:%■ 

• v 

. 4/ 
.10/, 

• 2/ 

. 2/ 

• 2/, 

■ V 

■ 2/ 



2 N 2219 A 

2 N 2222 A 

2 N 2907 A 

2N3055. 

2 N 3772. 

2N3904, 

2N3906. 

2N440L 

2N4403. 

2N5129. 

2N5139, 

2N5210. 

2N5951. 



.2/1.19 

. 2/.S9 

. 2/.S9 

. ,99 

. 2.25 

. 2/,69 

. 2/,69 

. 2/. 79 

. 2/.T9 

. 2/.69 

. 2/,69 

. 2Z.79 
.2/1.29 



CAPACITORS 

Dipped Tantalum ELECTROLYTIC 



lmfd®3SV 
,47mfd@35V 
lmfd@35V 
2.2mfd@25V 
3.3mfd@2SV 
4.7mfdiS25V 
I0mfd®25V 
33mfd®25V 



2/,89 
2/.S9 
2/.S9 
2/1.09 
2/1.19 
2/1.39 
1.19 
3.95 



100V MYLAR 



.001-.01mfd 
,022mfd 
.047m fd 
-Imfd 
,22mfd 



4/.79 
4/.E9 
4/.99 
4/1.19 

-1/1.2? 



Imfd £ 50V 

4.7mfd@50V 

lOmfd ®S0V 

22mfd®50V 

47mfa®50V 

100mfd®50V 

220mfd®50V 

1000mfd@25V 

22O0mfd@16V 

50V CERAMIC 
10pf-.022mfd 4/. 59 
.047mfd 4/,69 

.lmfd 4/.T9 



3Z.69 

2/.59 

2/.69 

2/. 79 

2/.S9 

.59 

.69 

1.19 

1.39 



MICROPROCESSORS 

Z80A CPU (4MHz) 13,95 

MC6800 8 Bit MPU 8.95 

8080 A CPU 6.95 

3212 3 Bit I/O Port 3.95 

8216 Bi-Dlrectlonal Bus Driver 4.49 

2513/2140 Character Generator 12.95 

8T97 Trl-State Hex Buffer 2.25 

AY-5-1013 30K Baud UART 6.95 

AY-5-2376 88-Key Keyboard Encoder 11.95 

2114-2 4K Static RAM (200ns) 3,95 

MK4116 16K Dynamic RAM (250ns) 3,95 

2708 8K EPROM 5.95 

2716 16K EPROM (+5V) 9.95 



Function Generator Kit 




Provides 3 basic 
waveforms: sine, 
triangle and square 
wave. Freq. range 
from 1 HitolOOK 
Hz. Output ampli- 
tude from volts 
to over 6 volts 
(peek to peak). 
Uses a 12V supply 
or a tSV split sup- 
ply. Includes chip, 
P.C. Board, com- 
p orients Si instruc- 
tions. 



JE2206B. $19.95 



o 

< 
m 

ra 
m 

3D 

» 
ce 



CIRCLE 10 ON FREE INFORMATION CARD 



105 



PLANS & KITS 



CABLE TV converters and equipment. Plans and 
parts. Build or buy. For information send $2.00, C 

6 D ELECTRONICS, PO Box 21, Jenrson, Ml 
49428 

BUILD light fountain from miniature Xmas lights. 
Beautiful Xmas display. Plans, including schemat- 
ic for light sequencer, useful for any moving light 
display. Send $8.00 to: F * M ELECTRONICS, 
Box 363, Grafton, IL 62037 

SUBSCRIPTION TV plans: 2300 MHz microwave 
dc'.vncoiwerter plus bonus UHF system, both 
for only $10.00. Best systems available, no inter- 
nal connections to TV) Parts and kits available, 
MC/Visa accepted on parts purchases. Send 
SASE for more information on these and other 
unique plans. COLLINS ELECTRONICS, Box 
6424, San Bernardino, CA 92412 

PORTABLE digital capacitor meter with 1% accu- 
racy range 1pF to 10,000pF uses readily available 
CMOS IC's. Build for under $25.00. Etched PCB 
and plans S12.95. Calibration components in- 
cluded. DRISCOLL ELECTRONICS, 57 Scofleld 
Ave., Bridgeport, CT 06605 

END adjacent channel interference on your TV 
set. Unique device enables your ordinary set to 
separate all channels completely. Makes new 
programs available. Complete plans, $5.00. REL- 
TRON, Box 91103-R2, Cleveland, OH 44101 

SAVE up to 90%! You can afford a computer. 
Free catalog. DIGATEK CORPORATION, Suite E, 
2723 West Butler Drive, Phoenix, AZ 65021 

DECODE Morse, RTTY, and ASCII signals from 
airwaves with new Code'Star. LED readout or 
connect with your computer/printer. Keyboard, 
other items also available. Kits or assembled. 
MICROCRAFT, Box 513R. Thiensvllle, W! 53092 
(414) 241-8144 

PRINTED circuit boards from sketch or artwork. 
Kit projects. Free details. DANOCINTHS INC., 
Box 261, Westland, Ml 48185 

WHERE to buy transistors, capacitors, resistors, 
transformers, etc. List $1.00 and SASE. Specify 
part needed. BAYNE ASSOCIATES, P.O. Box 
394, Oil City, PA 16301 

EXPERIMENTERS 25 projects kit, $4.95. Filters, 
multivibrators, temperature sensor, oscillators; 
more. Some experience necessary. Includes: 10 
resistors. 6 capacitors, potentiometer, LM3900N 
quad operational amplifiers, 2 transistors and 
manual. Postage: 654. Order through ELEC- 
TA ALL, Box 326R, Hillsdale, NJ 07642 

AUDIO kits. Equalizer— twelve bands/channel 
$100: 24, $225; noise reducer/expander, $110; 
LED meter, $42; see R-E cover stories 5/78, 3/81, 
2/60, or send stamp for catalog. SSS, 912R 
Knobeone, Loveland, CO 80537 

PRO JECTION TV . . . Convert your TV to project 

7 foot picture. Results equal to $2,500 projector. 
Total cost less than $20.00. Plans & lens $16.00. 
Illustrated information free. Credit card orders — 
24 hours. (215) 736-3979. MACROCOMGC, 
Washington Crossing, PA 18977 

MICROWAVE TV super performing downcon- 
verter kit special $55.00 + $1.50 shipping. Com- 
plete kit systems from $144.95 to $194.95. Free 
catalog. LAB-TRONICS, P.O. Box 171 RE, Rog- 
ers, MN 55374 

MICROCHROMA 68 expansion board. Includes 
32K DRAM, two 12K banks EPROM software 
selectable. Board like motherboard, includes wire 




MINI FM MIC 

Compact SE8. only i"x1'Wf, Transrml 
ro fm rw&o ee-iQS MHz. Exception* 
flwto quality Transmits alabls signal up 
lo SCO It CotnpfetQ k i met. case. tMiHory 
I instructions Only 513.95 Assembled 
$18 95 Add SI S5SJH«B Sorw 16c 
stamp lor brochure 

S.£. Corp.. BOS I69S9-R 
Temple Terrncn, Fl 33687 



FUNCTION GENERATOR KIT $59. °5 
| Auto -Ranging Cap-meter kit $79.95 

Phone 415-447-3433 

Write or Fiione for FREE CATALOG 
Average i minute S.tturdny call is 21$ 



coma 
TF.SI & 
EXPERI- 
MENTER'S 

EQUIP 



wrap area, edge connector. AST less EPROMs 
$555.00. Bare board plus two ICs, $95.00. Texans 
add 5% sales tax. Or write for details. WHITE 
ROSE ELECTRONICS, P.O. Box 19571. Austin, 
TX 7B760. 

AUTOMOTIVE electronics! Complete catalog, re- 
placement ignitions, voltage regulators, digital 
accessories, alarms, chargers, inverters, mileage 
aids, test equipment, also many kits. Sena" $3.00 
(refundable) AUTOMOTIVE, 1435 Exchange, 
Richardson, TX 75081 

MICROWAVE television education manual! New 
publication explores concepts, antennas, 
down converters: $16.25. Information package 
on microwave and other exciting television 
products: $2.00. ABEX, P.O. Box 2S601-RM, San 
Francisco, CA 941 28 

PCB. 15ttsq-ln. Free drilling. Satisfaction guaran- 
teed. INTERNATIONAL ENTERPRISE, 6452 Ha- 
ze! Circle, SI ml Valley, CA 93063 

ELECTRONIC catalog. Over 4,500 items. Parts & 
components. Everything needed by the hobbyist 
or technician. $2.00 postage & handling, refunda- 
ble with first $15,00 order. (Foreign $4.00 U.S. 
funds). T&M ELECTRONICS, 472 East Main 
Street. Patch ogue. NY 1 1772 (516) 289-2520 



^^ WRITE FOR 

JlIkiVlcGEE'S 

SPEAKER & ELECTRONICS CATALOG 
1001 BARGAINS IN SPEAKERS 

Tel.: 1 (8165 S42 5092 
1901 MCGEE STREET KANSAS CITY, MO. 64106 




DLAZING NEW TRAILS IN 
ELECTRONICS SINCE 1949 



FAHDH/COLft'L^ CCfWU^ 1 3MQ ^ ft^vyia iW 1M *, fr*j 



Govt. SURPLUS 
ELECTRONIC 
EQUIPMENT 



New ITEMS . . . New BARGAINS! 

FRFF UP0N R£ QUEsn 

' n " Send today for FREE copy of 
CATALOG WS-81 and Supplement. Dept. RE 



FAIR RADIO SALES 

1014 E EURtKA - Bo. 1105 • LIMA, OHIO • 4S802 




k 



SCOUNT 

BUY 
DIRECT 

1-800-841-0860 toll ran 
MICRO MANAGEMENT 
SYSTEMS INC. 
DEPT. NO. 1 5 

Downtown Plazo Shopping Center 

11SC Second Ave. S.W. 

Cairo. Georgia 31728 

91S-377-71M Go. Phono No. 

Write For Free Catalog 



FOR SALE 



nApt SCIENTIFIC INSTRUMENTS 

u «y| BOX 1054R LIVERMORE CA 94550 



UNEDITED movies, Wester super rod microwave 
antenna 53 db gain, down converter, preamp 
$269.95. Information $2.00. $25.00 deposit On 
COD's. D*D DISTRIBUTING, Box 174, Crapo, 
MD 21626 



PICTURE tube rebuilding equipment — we sell 
and buy new and used equipment. Free training. 
ATOLL TELEVISION, 6425 Irving Park, Chicago, 
!L 60634, Phone 312-545-6667 

CPU 280 $4.10, 280 A $5.40, EPROM 5V 2716 
$6.00, 2732 $15,00. MICROWARE EXCELTEK, 
Box 5143, South San Francisco, CA 94080. 
Wholesale telex 172029 SPXSRFl 

EPROM programming. Reasonable rates, quality 
work. Free details. ADTRONICS, 683 Branch 
Drive, Port Orange, FL 32019 

THE Intelligence Library. Restricted technical 
secrets — books on electronic surveillance, 
lock-picking, demolitions, investigation, etc. 
Free brochures: MENTOR, Dept. 2, 135-53 No. 
Blvd., Flushing, MY 11354 

GAME cassettes: TRS80 color computer 4K — 
$6.95 spaceship docker, rubout, racetrak 16K — 
$10.95; THANX PROGRAMS, 1100 Arbor Town 
Circle #1216. Arlington, TX 76011 

HEWLETT-PACKARD 608C signal generator 10- 
480 MHz $250.00. Electronic test equipment cat- 
alog 25$. EF ELECTRONICS, P.O. Box 249, 
Aurora, IL 60507 

SUPREME television-radio diagram manuals dis- 
counted 60%. Free Information. SASE. SU- 
PREME. 1760 Balsam. Highland Park. IL 60035 

PRINTED circuit boards: Your artwork, quick 
delivery, reasonable. Quantity discounts. ATLAS 
CIRCUITS, Box 892. Lincolnton, NC 28092 (704) 
735-3943 

COMPLETE line of microwave television con- 
verters and accessories to suit your needs. Con- 
verters have a one year warranty backed by a 3 
year reputation. Call or write for complete specifi- 
cations and pricing. Dealer inquiries invited, 
TRITON MARKETING, 1933 Hockaway Parkway, 
Brooklyn, NY 1 1236 (212) 531-9004 

NOSTALGIA crystal radio. Expertly handcrafted. 
Traditional style. Assembled and tested. Write for 
Information. BOB RYAN, P.O. Box 3039, Ana- 
helm, CA 92803-3039 

SCANNER monitor accessories— kits and facto- 
ry assembled. Free catalog. CAPRI ELECTRON- 
ICS, Route 1R, Canon. GA 30520 

MICROWAVE receiver system. Write: "Dealers 
Wanted," Dept. RE, POB 440668, Aurora, CO 
80044. (303) 620-9736 

RECONDITIONED test equipment. $1.00 for cat- 
alog— JAMES WALTER TEST EQUIPMENT, 
2697 Nickel, San Pablo, CA 94806 

2150 megahertz downconverters $99.95 up, as- 
sembled. Details for SASE. GW ELECTRONICS, 
POB 888, Greenwood, IN 48142 

RESISTORS %W. ViW 5% carbon films 3$ ea. no 
mlnimuma. 1% metal films. Send for details. Bulk 
pricing available. JR INDUSTRIES, 5834-C Swan- 
creek, Toledo, OH 43614 

1M teletypes, 140 PABX's. Best offer over $50. 
400 signal generators, power plants: offer over 
$3. Many others on bid. (60B) 5B2-4124 



AMAZING ^x 



SCIENTIFIC and ELECTRONIC 



DEVICES 

PHASER Shockwave and invisible FORCE FIELD gen-, 
erators. LASERS for weapons, cutting, burning, cloud 
writing, holography and special effects. NUCLEAR 
particle accelerators and detectors, PLASMA. ION. 
HIGH VOLTAGE, HIGH FREQUENCY TESLA COILS and 
LIGHTNING generators. TRANSMITTERS and CON- 
TROL devices for security, telephones, intrusion detec- 
tion, nature listening. PLUS PLUS INFFtASONICS. 
ULTRASONICS, ENERGY, CHEMICAL and PERSONAL 
PROTECTION and SAFETY DEVICES. SEND S1 lor 
catalog of plans, kits and completed items to: 
INFORMATION UNLIMITED, INC. 
P.O. BOX 716, Dept. R8 
Amherst, N.H. 03031 



MICROWAVE HORN ANTENNA KIT 

1 7-2S GH: FidiuHK, Rajigc IT-IS lb Em til (/tosrnbl, Ins1«clk»i S3995' 
Dowd CojVEflEF Surd' S19.95' VAn'tnra til SU9S1 
Puts tit Ik BuiiS K9K' M/Anltmu « Bawd 01 Uj 
tamplilj PacUgt lAnlena. load t Pals till S79.95 




MICROTEHHA ASSOCIATES 
2335 Sojth 2300 Wet Salt Lake City, Utah B4119 

flirt « M nnlf — Allw M Watt Orimry ICost include sfepcHigl 
-Utah flBidtflri Pitas: Mi S* Silo Te 



106 



CORPORATION 1%^^^^^ ^J ■' %# *W 



f.'apa(-iL«ir*»lL*a1-Timr t'lorJt ('-lend-.-- E F Jlhn^Dn "Trimi-i _ph "hh d '_*-_■ 

AF PKrdiieii»BMiitFit»»ZMlS»D«»kfc'Zfni4rr pktd-*»Erjadby / HnH* 1 ■ H I f"i *"*■ If CuiA 

*JvnrTo*wT«*Hejkt«« 1 KmWh ^f _» a- k*' I Wdw *-p* h™ _ *-" r vl I V'IUIpIV OdlC 

MteW pgQ tf Mf jj Supiv.ji'l.u^ii .j.i_ip_H.:iPcfc _j>itJi«PC Lj>- _, b fc „ ' 'JT™ 

ElwtroljtieCipjiHtoF**PolfOi[etoe{ert'C;«r LlM-k«Trin»i»[OfAnr CtochP*rtWHh A Pnflx JF 2" i.«. (;MA1026M] I* 2 For 1 



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, £! n * , Y, F ^! ir ?] : ** s * n " U«ki*l>l»m*.sd T«-fV P>M*it- 
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u n -.♦ t.lpi.o«]f ft ronie j * Uihin ■ Mu li™ el -j-' f, ED pi - IJ.ij. ikwt i 

li'Htit J-Enlt-i A Acf<-n.dTJc»*Soldf r WKlf'ANlJ MORE 



IS 



, J — TKASlMTRUMf NTS II TI^EMperaTuRE— f^EW Mft 10 _ 2 ^^j 

I.C, SOCKETS I PROGRAMMABLE MODULE ' 




J'--I ; I-..LJJIIUM 



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Vtw JMr-Mir Etl'hM.t. moniT*^ fA-ilfTth-r^ VlUwC OL D/GI-XfY GUARANTEE: **r wnv vitotyw**^ hMt>i»M<t 't*l ?*•' '*lttot*i-lM mMbt * ».»:!«.« AddiO.?> » StW.OD- IW9.W litnt^Q 

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m 

33 



CIRCLE 5 ON FREE INFORMATION CARD 



107 



Jnron-S'dvtn 

Equalizers Mixers^ LED Meters 



Featuring this month -our most. 
unique graphic equalizer! 

• 11 bands pet channel 

• 2 channels per band 

• Lowest noise, at any price 

• LED peak Indicator 

• MIC Input 

• High Alow level mixer 

• Built-in record switching— 

• no need to re-patch 

• Master gain control on each channel 

• Regulated power supply 
GRAPHIC EQUALIZERS 



>-€> • 



»% 



to 



CXlt? 



D«erl prion 
31 Bans Stria EQ. 

31 Rand Mono EQ 
ZIBorHSItrMEQ 
21 Band Mann EQ 
11 Boris SltrtotO 
11 Band Motto EQ 
11 Bo.io 5F>r«) [C 
■ A: ihown ofjc.,-0 1 

a Band smto eo 
S Band Mono EQ 



Kit 



1379 S6 
•IS7 0J 
•205.O! 
1125 OS 
1114 9* 

» n.t* 

)129.SO 

I » 50 

1 19 U 



LED METERS (All Intagialad circuits!? 

DDT or BAR Pattern, 3 position range switch 



ism s* 
tMS S3 

H2I 02 

t230.00 
1151 .57 
ill! BO 

>14B99 
t M 27 



Dturiptlon 

Fronrponflmounl anlir 
10 LEO (Mana) 
20 LED (Sr««) 
Caomii or Rock Moy.nl 
20 LED (Maud) 
40 LED (Sriito) 

Down lo - TldBI 



Kir 



MHO 
1S2 20 



(5040 
167 00 



Mtg. 

jssso 
ie« oo 



SMOO 
156 till 



Total IraqiMncy response tOHzto WOXHz ± 05<JB unwelgniad! Bona liequBncies KHz 
Bond frequencies. BHi to KHz and 20Hz lo 20KHz 

Order with this Coupon or send tar product specifications. 
Check box tor The Item ol your choice send check, money order. COD 

or Vlso. Master Charge, your cord number__ 

Exp. dote . . Add $7,00 tor shipping and handling. 

Check style : Rock Mount O Flat Cabinet D Upright Cabinet 
Check Freq. Range: 16Hz-16HKz □ 20Hi-2OKHz 



crrr 

Aaron -0a* In, 1901 



STATE IIP 

i. De>r« SI , D.DI. IB, Santo Ano, CA 92705. Chant: (714)957-0710 



4116-4 MEMORY 16K 8 for $10.00 

8164 MEMORY 64K 10.00 

8264 MEMORY 64K 12.00 

4Kxt6 MEMORY board w/64 2101 chips 50.00 

MPI 8 inch single side disc drive (OK, used) 175.00 
MPI 8 inch dual sided disc drive (OK, used) 350.00 
SHUGART 8 inch drive 850 FDD (ok, used) 425.00 
MOTOROLA MONITOR 9 inch 115 volt 60.00 

MOTOROLA MONITOR 12 inch 115 volt 85.00 

Above 2 units accept composite video, no case, used, 
2 units below accept TTL. Hi volt supply only. Used. 
BALL BROS. 12 inch monitor 50.00 

BALL BROS. 5 inch monitor, cased, used. 60.00 

DATA STATION CONSOLE w/key board & 9 inch 
monitor, power supply. Logic boards broken send 
for details on this one. $ 80.00 

I R SCOPE see in the dark, new, portable. 260.00 

IR SCOPE KIT pre-assembled, modular 150.00 

12 VOLT GEL CELL 2% AH $14.00 5 AH 17.00 
12 inch CRT bonded face plate, new, with specs. 
Made for computer work. $25 each 5 for $100.00 
UNDERWATER HYDROPHONE 200 KC 10.00 

WALKY TALKIES Govt surplus used? 
condition. 47-55.4 mc range. With 
schematics. Govt AN/PRC-6 
S25 each 2 for S45. Ant. $5 each 

ASCII KEYBOARD parallel S50 
RED LED's 10 for S1.00 

MIN ORDER S10.00 CATALOG 2 ! now ready 

Shipping extra on all merchandise 

Meshna Inc., PO Box 62, E. Lynn, Mass. 01904 




CIRCLE 11 ON FREE INFORMATION CARD 



CD 

g 

z 
o 

LU 



g 

Q 
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108 




COMMAND PERFORMANCE 
LED CLOCK MODULE 



FIRST TIME EVER OFFERED ! 

FULLY ASSEMBLED 
REAL TIME 

1-10 Units $34.95 

11+ Units $31.95 

ELAPSED TIME 

1-10 Units $39.95 

^ 11+ Units $36,95 

KIT FORM $24.95 

r'*.V-" (Real/Elapsed Time) 

• Battery-Operated: Two Alkaline "D" Batteries 
* Sound-Activated Module ■ Sensitivity control 

• 9" Digital Readout • 4x4 Printed Circuit Board 

"^UHl^TRTJMETifsjNC - 

8126 MIRAMAR ROAD • SAN DIEGO, CA 92126 

For further information or to place order call (714)578-4050 

Total Amount of Order $ 

CALIFORNIA RESIDENTS ADD 6% SALES TAX 

NAME 

ADDRESS . 

CITY . 

STATE ZIP 

Enclosed is: D Check □ Money Order 
Charge my: D M/C □ VISA 

ACCT.# EXP. DATE , 

Free Catalogue With Order • Dealer Inquiries Welcome 

CIRCLE 61 ON FREE INFORMATION CARD 



hJ:UILm*.J:UrT7TTETJ 



Daisy Terminals 

Featuring 1 10, 150and 300 baud. RS232 

I/O. Full KSR, full or half duplex, Diablo 
Hytype-l printer, plastic Daisy wheel, 
otl-lease and refurbished. 4-way 
ploiring mode under remote or KBD 
control. Built in KBD, ptr. typing table, 
power supply and more, with user 
manual and schematics. Refurbished. 
*999 00 ... 

Atid $45.00 for Crate - Pay Shipping an Delivery 




Selectric Terminals 

Famous Datel-built "Selectric" I/O 
terminal. Used, "as-is" eond. (may need 
minor service). Features 15" carriage 
Selectric typewriter/printer, KBD/Sole- 
noid assembly, power supply & RS232 
I/O circuit board. Speaks IBM •'corres- 
pondence'' protocol Limited info 
included. 
Used "As-ts" . . . Only *499°°... 

Add $20.00 tot Packaging & Handling ■ Pay Shipping on Delivety 




DEC LA-36 Terminals 

Off-lease and relurbished. these are the 
famous DEC dot matrix, 30 character 
per second RS-232 terminals with such 
advanced features as 60 cps character 
catch-op print rate for true 300 baud 
operation Built by Digital Equipment 
Corp 132 columns, tractor-fed. 
Refurbished Only *739 00 « 




Pay Shipping on Delivery 
WRITE OR CALL FOR OUR BARGAIN-PACKED PERIPHERAL FLYEH'1 



rAMDIITCDC Formerly CFR Associates. Inc. 

IjUMKUTbKd, 617/372-8637 

LlbnlrUbKALo, is granite street 

I I Ml IMITCni HAVERHILL MASS. 01 B30 



CIRCLE 35 ON FREE INFORMATION CARD 



SURPLUS 

ELECTRONICS 

CORP. 

7294 NW 54th Street TWX: 810 - 8 48-6085 

Miami, Florida 33166 WHOLESALE/RETAIL We accept MasterCard and Visa. 

EQUIPMENT/COMPONENTS/WIRE & CABLE/ACCESSORIES 



£ 



"TANK BATTLE" TV GAME 

In |usr a short lime and with a lew minor parts, the most 
novice twubffist can com piece this exerting Tank Battle 
game. Create a fun-filled evening tor the whole family. 
Two independent tanks rumble thru land mine fields, 
shoo: shells and fragment when hit Four distinct engine 
sounds are produced for Ihe different speeds. Sounds of 
gunfire, shell bursts and lank explosions are realistic. 
Automatic on-screen scoring. Supplied wflti schematic 
drawing. 

SOLD AS IS 

$9.95 ea. 



C.B. SPECIAL 

CONVERT THESE T0 10 METER FN! 
New HY-GAIN printed circuit board assembly with PLL02A 
chip and 3 crystals. (Squelch pot. volume control and 

channel switch not included . ) Boards so Id as is . 1 he way we 
bought them from the manufacturer. Board dimensions 
6-x 6Wr 

1-9 $7.50 scwSB.OO 

10-49 $6.50 ::; J- S5.50 



COPPER 
CLAD BOARD 

(Double Side) 

Size 9.25x10.75 
Thickness .062 

$2.00 m 



DIP SWITCH 



5 POSITION $1.00 ea 

8 POSITION $1.50 ea. 

10 POSITION $2.00 ea 

12 POSITION $2.50 ea 



AMP METERS 



2Vsr square, no shunl required. 

Easy to read dial. 

Movement: 0-6. 0-10,0-17 

$2.50 ea 



SPEAKER 



3"Diam. 
8 OHM. 
5 Waits. 



$2.00 . 



TRIMMER CAP 

1.5-20pF 

[ARCO PC-402) 

50$ ea 



TT~ 



SUB-MINI 10K POT 



5/S1.00 



with On-Ofl 
v i" hole mount, 

Vi" D shaft. 
' thread section. 



POWER 

TRANSFORMER 

$14.95 ... 

Primary -115 vac 
Secondary - 32 v with 
24 v tap at 15 amps 
Dim.4ti"hX3¥*"wX4"deep 



SCREWDRIVER KIT 



Handle stores four blades 
2 single slot 5/32" 4 3/32" 
1 phi flips 1 scratch awl 
6" long with one blade inserted 

$1.00 ea 



TEXAS INSTRUMENT 
KEVBOARP 

r«" 



Has 3 slide switches, 26 different 

keys, key pad removable by 4 screws 

$1.95 ea 5/$8.00 



COAX CONNECTORS 

UG.-273/U BNC-F/UHF-M $2.50 

IG-255/UBNC-M/UHF-F $3.00 

UG-146A/UN-M/UHF-F $4.50 

IJG-83B/ON-F/UHF-M $4.50 

UG-1 75 RG-5B Adapt $ .20 

UG-1 76 RG-59 Adapt $ .20 

UG-1094 8NC-F/Panel $1.00 

SO239 50C 
PL259 60C 

COAXIAL CABLE 

50OHM-RG174 

$4.95/100 S3. 00/50 

75 0HM-RG62/U 

SI 2. 00/1 00 



C&K SWITCHES 



L-3 



J- SO 



J-3 

Movement 
SPOT 
SPDT 
(center oft) 
SPDT 

(momentary) 
DPDT (special 
large rocker) 

$1.00ea 6/$5.00 



Part* 

J-60 

J-60 

L-3 

J-3 



7101 
7103 

7108 

7201 



E. F. JOHNSON S 
METER 



Edge Meter 250 LA, 
tits in Wx1W hole. 

Black background. 

Scale 1-20 Top, 
0-5 Bottom. 

$1.25ea5/$5.00 



COMPUTER GRADE ELECTROLYTICS 



VALUE/MFD VOLTS 

63,000 @ 15V 

10,000 @ 20V 

2.700 @ 25V 

2.900 @ 25V 

100,000 @ 30V 

39,000 @ 30V 

34,800 @ 50 V 

450 @ 75V 

500 @ 100V 

240 @ 300V 

50 @ 450V 



DIAM./LGTH. 
3" x 5 1 /i" 
1Wx5%" 
1W'x2V 
1W'x2" 
3' x 5'/2" 
1" x 5W 
3" x5Vi" 

V/t"X.2W 

1W>"x3'A" 
1W'x3'A" 
1Vx2" 



PRICE 

S4.00 ea 
$3.00 ea 
S2.00 ea 
$2.00 ea. 
$6.00 ea. 
S4.00ea 
S3.00ea 
$2.00 ea 
$2.00 ea 
$2.00 ea. 
$2.00 ea 



24 Volt 
POWER 
SUPPLY 

5.4 AMPS 

$45.00 ea 



MFG by ACDC Electronics Inc. 
Model OEM 24N5.4-1 
Input 105-125 vac 50/60 Hz. 
Has volt adj and O.L. adj. 
Output terminals contain 
+ out. + sen, - sen, - out, acnem, 
ac line and GNO. 



AXIAL LEAD 

ELECTROLYTIC 

CAPACITORS 



2llF@ 
10uF@ 
20llF@ 
SOiiFtffi 

2.2 uF@ 

3.3 uF@ 
1 uF 
2uF 

25 UF 
3uF@ 
5uF@ 

10uF@ 
250 uF@ 

50uF@ 



15V12/S1.00 
16V12/$1.0O 
15V12/S1.00 
15V12/S1.00 
25V12/$1.00 
25V 12/51.00 
35V12/S1-0O 
150V12/S1.00 
25 V 15/52.00 
50V15/$2.00 
50V15/S2.00 
50V 15/52.00 
25V 10/52.00 
75V 10/52.00 



MODEM CABLE 
ASSEMBLIES 



$5.50 < 



22AWG 
#Cond 



Length 



9 VOLT NiCd 

RECHARGEABLE 

BATTERY 

NEW. Replaces 

the popular 9V 
Transistor Battery. 

$4.75 ea 



PROJECT BOX 
$1.50 ea 



4Vwx7WlxVlo1V2"h. 
Has a lip for recessed face 
plate and a felt bottom 



POWER SUPPLY 



| - 12 vrfc .1 amps 
- 5vrJc ,4 amps 



$3.95 



ea 



IC SOCKETS 

GOLD-PLATED 

WIRE WRAP 

14 pin 40c ea 
16 pin 45c ea || 

40 pin $1.75 ea 



MUFFIN FANS 



MFG By Rolron Inc 

3 Blades 4 V Square 

USED 

110 VAC $5.95 ea 
NEW 

230 VAC Model MU3A1 

$12.00 ea 



NEW 
SPRITE FAN 

Mfg. by Rotron Inc 

Model SU2A5. 
115vAC.19amps. 

[Impedance protected ) 
3W*x3W'x1W' 



$12.00 



ea 



7 POWER CORD 

HEWLETT PACKARD TYPE 



Molded 3 Prong 

Plug with molded 

receptacle 

BeldenlSAWG 



$3.00 ea 



MAGNETIC CHESS BOARD 
WITH MEN 

Folds in half to carry men 
11"wx11"lx1'h f 

$4.00 ea 



z 
o 
< 
m 

S 
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m 



TERMS: All material guaranteed unless otherwise staled- If you are not satisfied with our product, it may be returned within 10 Cays for a refund (less 5hippir>g)- Please 
add 54.00 tor shipping and handling on all orders. COOs accepted for orders totaling S50 Of more. All orders shipped UPS unless otherwise specified. Rorida residents 
please add 4% sales tax. Minimum order, 515.00. Foreign orders- US Funds only, add 20% for shipping and handling. 



CIRCLE 4 OH FREE INFORMATION CARD 



109 



7400 



sNhhn 

SMJ«JN 

5NJ*friN 
£.N74< .-if J 
SNT4C6N 

5N?41r7N 
SNT4MN 
S.N74C9N 
5N7410N 
SNM1LN 
SNH1JN 
5NM13N 
SN^HN 
SNHWN 
SNMHN 
ShfMZDN 
SN7421N 
SNHHN 
SNM2JN 
SN7425N 

SN742JN 

5n;*24h 

SN71JJN 
5N743JN 
SNM3JN 
SNM51N 
SNT439N 
SN7440N 
SNJM1N 
SN7442N 
SNT*4JN 
SN7444N 
&N744SN 
SN744SN 
SN7447N 
5N744IN 
SN7450N 
SNT451N 
SN745JN 
5N7454N 
5NMS9A 
5N74S0N 
5Nr470N 



74L5D0 

.■:;_.":: 

MUSK 
ML.SH 
MLStV 
HLSOS 
74L58t 
74LS09 
?4L5]0 
MLS]] 
HLSIJ 
HLSlI 
74L514 
74L51S 
74LS2Q 
MLS21 
74LS22 
MLS3S 
ML52J 
HLS2t 
74L5J0 
74LS32 
74L533 
74L537 
HLS3t 
74LS40 
74|_S4f 
74LS47 
MU5*t 
74|_S4i 
74L55I 
74LS54 
74LS&5 
74L573 
T4LS74 
74LS7S 
"Ml LSI* 
NLSJ1 
74L5J3 
74LSJ5 
HLS56 
74LS40 



74 SOD 
r4502 
74S03 
MSW 
74505 
JlSCfl 
74 £09 

mshj 

MSI] 
MS 15 

MSJO 
74522 
HSM 
34SJ2 
74S3* 
7*540 
7455] 
M&S4 
74545 
3MSH 

ns« 

745112 
I4S113 
MS] 14 



CA30MH 

CAMIJH 

CA3023H 
CA3D15H 
CAJDiftM 

CAH^N 



£ 



CD4000 
CD4D01 
CD40Q2 

ccriou 

CP4Q0J 

CD401& 
CD4D1J 
CD4D12 
CD403J 
CD4Q54 
CD4Q15 
CD40IS 
CD40I7 
CG40IS 
CD40I9 

CD402I 

CD4Q23 
CD4Q23 
CD4Q» 
CD4QJ5 
CD4D26 
CD4<B7 

Genoa 

CD4029 
CD-tOJO 
CD4034 

C 0*035 

L CD4KE 






Lie 
1-10 



SN7472H 


.29 


SN74JS6M 


SNM/J'I 


-X 


5N74LWN 


SN74KN 


JS 


^MMltaiN 


3N7475N 


.49 


SN74161N 


5N7474N 


-X 


SN74S6J-N 


SN7471N 


5.oo 


SN74I&JN 


SN^HDN 


.50 


SM74J64M 


SN74I2N 


.99 


SN74EBN 


5M74JLJN 


.69 


SN74tS«^ 


SN74»N 


-59 


SN74U7N 


SN/4KN 


.9 


SN74S7QN 


SNT4HN 


LB 


yr,.'<iH'j 


5N7494N 


,49 


SNM17JN 


5NW1N 


-59 


SN74I74N 


SN7492N 


.45 


SN74I7SN 


SNifflN 


.44 


5N74IMIM 


5NWMM 


.69 


■ji.-A\;:-i 


5N74KN 


.» 


SNHJ79N 


si^7«sri 


.» 


SN74I»DN 


SN7447M 


3.qq 


SN74II1N 


5NJ4LMN 


l.« 


5N74SHN 


SN7*]«N 


49 


5N?4I*IN 


SNM1WN 


.19 


SNHI&N 


5NM1&TN 


-39 


SN74]*0N 


SN741D1N 


.39 


SN74]91N 


5N74116M 


1.95 


5N74I9ZN 


SN 74131 N 


.39 


5N74WJN 


SM741QM 


,51 


■j-ii-i^r. 


SN74123N 


-5? 


SN74J95N 


SN74125N 


.44 


SH7419SN 


SN74L20N 


.49 


5N74197N 


SHT4UJM 


JS 


SN741SN 


SN74JXN 


.79 


SN 74199 N 


SN74141N 


.n 


■!■■■: 'J:;-;r, 


5N741I2N 


3,29 


:,-!■.;;,! n 


SN74143N 


3JS 


SNJ42WN 


SM 1*MH 


144 


SN74271N 


SN741HN 


.79 


5M7433N 


SN74147N 


1,99 


SN743MN 


5NMUIN 


1.29 


SM74»N 


SN741MN 


LSS 


SN743HN 


SN741S1N 


.64 


5N743&SN 


SN74JL-J.N 


,» 


5M74367N 


SN741HN 


.W 


SN74JUN 


SN74154N 


l.» 


s--:N::-jr; 


SN74159N 


.79 


SN 74393 N 



74LS 



74LS93 
HUSH 
HL9M 

74LSM 
HLS1&7 
74LS1M 
74 LSI 12 
74LS113 
74L5114 
74LS123 
74L£li3 
74LS125 
74LS1S 
7* L 5132 
74L5133 
74LS13b 
74L513I 
74LS1S 
T4LS1&1 
74L5153 
74LSU4 
74LS1S5 
74L51ifi 
T4L.5147 
7*L5lM 
ML3U0 
74 L SKI 
74L51S? 
74LSU3 
74LS1W 

74L51K 
74LS1&9 
74LS17Q 

•■:....:■: 
74LSt74 

?4LSL?S 
HLSilt 
74LSLW 
7*L5l»l 



LIS 
LIS 
LIS 
LIS 

Lli 
US 
1.1* 

LI* 



741.SSM 
74 US 293 
74LSI94 
74LSIH 
74LSE97 
74LSHI 
74LS240 
HLS24I 
NLH4J 

ML5244 
7*LS^5 
74LSM7 
14L524I 
7iLS:H 
HLSMt 
MLS2S3 
HLSE7 
74LSS1 
T1L53H 
74LS2M 
74L.S27J 
74LS273 
MLS2U 
T4L&290 
74LSWJ 

7*L5B! 
HLSiy 

T4LS365 
74LS366 
74LS367 
74LS3M 
74L3JT3 
74LSJ74 
74LS375 
HUSH 
741_5»3 
74L5JW 

Husin 

1ILS» 
4IUS9T 



74S 



74S1?4 

745133: 
745134 
74S13& 
74S1X 
74S]» 
74SS39 
HS14D 

HS1S3 
J4SS5J 
HSISi 

?4St6D 
H5I74 

Hsm 

74SIB 
745W 
7i51K 
7451W 
14524^ 
74524] 
745342 



L.l» 
1. 35 



1-59 
?,« 
LB 
l.S 
1.95 
1M 
3.» 



MS343 
HSM4 
74S»1 
745»J 
M51T57 
74S254 
7452M 
74S2t3 
74S2BJ 
74S2B 
745J7J 
74S374 
74534) 
MS47I 
74S47? 
74S47J 
745474 
745475 

74SSJI 
74S57? 

?45573 
?4594b 
HS941 



CA^LINEAR 

CA3C&DM i.n 

CAJC«H LB 

GA3K3N ?.« 

CA30UM J.DO 

CA2«!N |,M 

CAJttSN .«5 



C /---If/At, 
CAS130H 
CA3140H 
CAJ]frDH 
CA3W1N 
CAJMON 



CD-CMOS 



CD4W1 
CD4H? 

CD4W3 
CD4W4 

CD4W 
CD4W7 

CD4Ht3 
CCMD49 

crau 

CD4«1 

CD4«6 
CO40W 

CD4KQ 
CD40U 
CNOH 
CD4K9 
CD407O 
CQ4Q7/I 
CDCD77 
CD407J 
COtQK 
CO4076 
CEHQ7] 
CCM0K1 
CE>4«2 



1.J9 

U9 
119 
3.-K 
9.4S 
1.49 



CO40U 

C04556 

CQ4»7 

CD45C4 

CD45IO 

CD4SI1 

C04SI3 

CD45I4 

C045E5 

CD45I& 

CD4SK 

CD45I9 

CD4520 

C04U& 

CDtUt 

CD4i» 

CD4543 

CD4«? 

CD4W 

CD4513. 

C04»4 

CD4/Z1 

CD4W4 

MCE4409 

MCL4410 

M:Ct4411 

MC144I? 

MCL443S 

MC144J3 

IMCJ453) 

MC14541 



7.J9 




l.fi 


* O Cinad i 




• Colcml Dcoa^ 


I.H 

.99 


* WmlmiAulif C*iw*i 




* Tu . nk in, 1 * inhm Li 1 1 1* 51 1 


* DaulAchlaivlliM 




* Gad Svrve lh» Ounn 



1.49 
?-» 
1.19 
1-19) 
1.19 



1.29 
L29 



!*9 
Z.49 

2.43 



Z95 
IK 
3.75 



2.95 
J0.95 

10,95 
l&.'Ji 
1?.» 
1?.H 
S,«5 
S.9S 
9-» 
9.95 
115 
115 



J. 21 
L29 
1.49 
IK 

,.■■:. 



1L95 
2.79 
7.49 



17JS5 
lt.» 
15.9S 

15.H 



&h«n* Bunes ) 




At St»n on -Gpotf .Uo^Jijp 4pi*'fCJ M 

Replaces the Telephone* Rlng*r Bell 
with e Selection ol 30 Familiar Tunos 



s-fl — l 

Til#prnm* PTD» Will Jack 



Cich yfii'f nrWpttr *ny Bl lk4 toitowin\ 
• CiT.=ni Encoumnri ■ Gmnili»'ra& 
Hippy 



■ P«np £ Ci rMunstpriw 
lotbibi ■ Win -am Tdl Ororturn 

Eyes a\ Toxaa * Bach TOtcal-j >n D Mmnr 

Sun Spangled Baf.ntr * Shfvff and « Hmlrcul 
OftngH and Lemon* ■ Blue DanylM- YtMj 
Wllh"l*nus * OH i M-.-.-,f n;. ;,].■■ 

MQTlft SWialU ■ La Mir»|lllru 



Wedd no Much 

Jmg if ISBl'.s 

AuKf Lang Syn^ 

E'i id- c i = '- llOru; 

5«(loi J s Hofnpipff 

Ch«rg*l FEATURES 

Remacvi ntonoKxwua. telacihon* nr-gcr bell Sm\y conrncli: lo iny sEandard Ealaph^w Can Im uHd 
I'Ongildi fftjnrlar phnnc & rcplicn w lomplfl- rlnnar ClItuMl'-^lb Irt huilding -pr Wftaidfl FCC apfKGYfrd C*n b* 
vnwf en any |al«php4i« syHvn — woiWWfdV Us* a dilloranl lu*w lo idcniiry a;rtnMi3«n ph&THM 
Mic<d>ioce3aor conmsilwf. Adjussahfe vcIujab conLrdl and varia.bla Luna tpead tontrpl 0p«ra?c4 on two 
9 veil balLclJD* g- AC Adaplcr [net incLufiffll 

PT030 Phone Tunes J49.95 

AD 30 AC Adapter S8.95 



r DISCRETE LEDSI 



XCHCR JDO" f«d 

XC:iv:.G .S»" grtan 

XC554Y .^D" yttlonv 

XC554C .;■??' clc-Jf 

XC22R ,3»" r*d 

XCJ3G ,J»"sr*tn 

XC22Y ,20D"yalIOW 

IVtVlCQ .in" r«d 



ViL 
4j*l 
4/K 
4/J1 
5/il 
4/« 
4/JL 
4/Jl 



MVSfl .Qfl&" r«e) S/Sl 

XCZOJR JSt" red 5/fl 

xc:«a .IS'-grami 4/Sl 

XC?MY J»" yguow 4/Sl 

XCiKR -US" red S/Sl 

XCSMG .US 1 " ora*n 4/il 

XC93GY .US" yallow 4/J] 

XC536C .!»" cle*r 4A1 



C.A. — Coirimon Anode 
!_■•'■ — !■■:!;:/ Dlgft 
Typ« PcEarlly 



Diffused Bi-Colar LED 
Part Mo. 1-&& 100+ 



-0»n 



■ M* *tu Led, metal. 

MTC. Haw, H ,r LUBt, 

RL-2 , . S.39ea.or3/S-l.OO 



- CfllY 



MAN I 
MAM? 
MAN! 
MANS2 
MAM 54 
MAN 7] 
MAN 72 
MAN 74 
MAN I.' 
MAN 14 
MAN »M 
MANJHO 
MAN 3643 
MAN4&10 
MAN ttlti 
MAN»30 
MAN 6&43 
MAN ASM 
MAN6663 
MAN 4714 
MAN S740 
MAN67S0 
OLOJW 
OLO307 
DLG50Q 



-red 
5x7D.M.-r«d 

C.C.— red 
C.A.— ijraian 
C.C.— arun 
C,A— r*4 
C.A. —rod 
C.C.-r*d 
C.A.— yellow 
C.C-— VfllliOW 
C.A.— oransa 
C.A.— orange i 1 
CX- print* 
C.A.— ortns* 
C.A. — orange— DD . 
C.A. —orange ^ I 
C-C-orange— OD . 
C.c.-oranee i I 
C.A. —orange 
C.A,-rM-DO 
C.C-f#fl-DD 
C,C.-r«Q i I 
CC- oranoe 
C.A.— oranee 
C.C.— green 



Price 
?.« 
4.9S 



RHD - 
Polarity 
CA.- g<«a n 
C.C.-reo 

C-A.-r*d 
C.C.— rao 
C.A.— rad 
C.A.-fftt* 

C.A. -of Inge 
C.C.— oranae 
C-C-red 

tci i 

c!c! (FN MB! 
C.A, (FNDS1&J 



Typw 

DLOSP 

OL704 

DLW7 

DLTct 

DL741 

DL747 

DL750 

DUOH7 

OLOSM 

OLJ3B 

FNDjV 
FMD357 

FND5W 

FND50J 

HQ5P-3401 C-A-— red 

HDSP-3401 C.C- rad 

HDSP-340S C.C. red +1 



S0C'?7S] 

&0|2-77» 

»G-7Xa 

50C-7»2 

SDE-7i4Ci 

4NJ! 

UIT-I 

MOC3010 



.Kg 



LSD 



C.A. d R.H.D.— rad 

C.C-,R r H,D.-reo .430 L» 

4x7Numes'lc(RHCi).e» 22.00 

4x7Numarlc{LHO).S« EM 

4x7Hxdcl. (M/AF) .SOd 22.S4 

PtiOto XtlitaiOpto-lsoL ,» 

Photo Xiltfor Dp-to- Hoi. .69 
Optl cilly lior.Trlac Drtwar |,2S 



SOCKETS 



P«n_N_o, Pirn Price 

2(4-3339 Lt pin 5.« 

?t&.J340 Lficlrt «,*9 

?U-3341 LB pin 7.9S 

2KJ-334? HJptn t95 



Test 



Sockets 



RECEPTACLES 



ZERO INSERTION FORCE 



Nicket Sorer. PUting 
G r F, f'SF-" Pleiiic Body 

:"■'. leilmg ;■'.':'- 
Part No. Pins Price 
22J.JJ43 22 pin ~9ls 
224-1344 24 pin 9.B 
22B-1345 2B pin ]].SS. 
240-J344 40 pin 12.H 



LOW PROFILE 
ITiNI SOCKETS 

ifM 25-49 SfrlCC 



soin up 

14 oi n UP 

it pin LP 
It pin LP 
20 OdTi LP 
27 pin LP 
?4 pin UP 
2-4 pin LP 
* pin i.i J 
40 pin LP 



.17 



ijs is*,, 



t pm SG 

14 pin SG 

15 pin 5G 
It pm SC 
24 pin SG 
St pin 5G 
34 pin SG 
40 pm SG 



SGIDERTAIL (GOLD) 
STANDARD 



* Nickel Boron Plating 

* Q.JF. PBF Plaitic Bodv 
► Wire Wmp Contact! 




Pert No. PjM Price 
214-3992 14 pin 9.75 
216-3593 IS pin 9.9S 
23E-35S4 Upln Ja9& 
220-3595 20 pin 11.95 



Part No. Pin} Price 

227-SM 22 pin 12.95 
224-JS97 24 pin 12.75 
KJ-i«8 a pin 1.3.9* 
■WOT 43 3ln 15,95 



SOLDERTAIL 
STANDARD (TIN) 



14 pin ST 

15 Pin ST 
IS pin ST 
24 pin ST 
ft pin 5T 
36 pin ST 
40 Pin ST 



If 



WIRE WRAP SOCKETS 
(GOLD) LEVEL #3 



IRIli 

S i-.ii WW 
10 pin WW 

14 pin WW 

15 pin WW 
It Pin WW 
Jfl pin WW 
22 pm WW 
24 pin WW 
a pin WW 
X Pin WW 
40 pin WW 



].0t 

LX 
1.26 



1/4 WAH RESISTOR ASSORTMENTS -5% 

$1.96 
$1.95 
$1.95 



A&5T. 1 5ta. 



ASST. 2 Sea. 



A EST. 3 5ae. 



10 Ohm 15 Ohm 15 Ohm It Ohm 22 Ohm 
27 Ohm 31 Qhm 39 Q hm 47Qhm SS Ohm 
H Ohm 12 Ohm 100 Ohm 130 Ohm LS0 Ohm 
J»Ohm 7K Ohm 27Q Qnm J» Ohm 390 Ohm 
470 ohm 5w Ohm sio onm t» Ohm I k 

1.2K 1.SK I.IK 2.2K 2.7K 



SO Ret. 
FiOpci. 
50 pet 



ASST, 4 54*. 



UK 

t.2K 



ASST. S Shu 



ASST 7 5ea. 



22K 
MK 

ia0K 



19K 

_I0K 

27K 

SlK 



4.7K 
I2K 
3JK 



S.SK S.tK 

laK ]|K 

JSK 47K 

IPOK t»K 



50 pet. 
50 pes, 



$1.95 
$1.95 



IKK 
470K_ 

" 1-2M 
3.JM 



2I0K 
9S0K 



LSM 
3.9M 



270K J»K 

SMK I20K 

l.tM :.?m 

4.7M 5 P fM 



50p«. $1.95 



50o«. $1.95 



ASST. 8 R 



Includes Resistor Assts. 1-7 {350 pes.) $10.95 sa. 



$10.00 Mm. Drdtr - U.S.. Funds Only 
Calif. Residents Add 6%StMH Tax 
Poitage— Add 5% plus $1.50 liriurance 






J a 
laaaaiiiiimaa 



Spec Shiffti -2Si 

Sand 8fi^ Poiltgc ior your 

f REE 1882 JAM£CO CATALOG 

PH0N£ 

ORDERS 

WELCOME 

(415) 592-8097 



MAIL ORDER ELECTRONICS - WORLDWIDE 
135S SHOREWAV ROAD, BELMONT, CA 94002 
PRICES SUBJECT TO CHANGE 



Peri No, 
Tonipi 

70REV/KII' 

710GCPL 

nosev/Ki-c 

7S05CPL 
7]07EV/Klt* 

71WCPL 

ni7CPL 

7201IDR 

73061 PG 

730SEV/KLI* 

IM&CJPEl 

720SCEV/Kit- 

7207 AIRD 

7J07AEV7KH* 

73MIPI 

7XNIPA 

7215 1 PG 

T21SEWKIt* 

J2WAUI 

72WCIJI 

721aOlPt 

72171 J | 

7719CU1 

7224 liPL 

72XAIJL 

TiJSAEV/Kif 

7240 UE 

7242IJA 

725fl UE 

72SOUE 

75&51PA 

■JM4IPD 

7SJ1BCPA 

7E12QCPA 

7621 BC PA 

7931CGPE 

7S41CCPO 

7S42GCPD 

J6&KPA 

U34CCRD 

HOtCCPE 

tOSSCCQ 

1211CPA 

B12CPA 



Function 

CMOS- Pra-tlilon TJm*r 

Stopw«|ch Ch|p F XTL 

IVi Digit A/D fLCD Or.va] 

IC. Circuit Board. Display 

J'.- Olgll A/D {LED Drive] 

IC. Cirtuil Board. Display 

W Digit A/O LCD Dl(, HUD. 

3ti Digit A/D LED Oil. HLD. 

Low Biliary Volt Indicator 

CMOS LED Stopwetch/Tlmtr 

StOPwalch Chip. XTL 

Tone Genefefor 

Tone Genaralor Chip. XTL 

Os£hletor Controller 

Fred, Counter Chip, XTL 

seven Dacicra counter 

GlocK Ganerefor 

4 Func. CMOS Stopwatch Ck.t 

4 FunC. Stopwatch Chip, XTL 
j-di^l univ. cour-iar c.A, 
l-DLglt Fraq, Counter C.A, 
I- Digit Froq. Counter c.C. 
4-Dlf|lt LED Up/Down Counter 
a-Dleh Univ. LED Drive 
LCD 4¥i Digit. Up Counter DRI 
i-Dlglt Unlv, Counter 

5 Function Counter 'm-,-, XTL 
CMOS Bin Prog. Turner/Counter 
CMOS Dlv|d*-hy-2» HC Timer 
CMOS BCD Frog. Timer/Counter 
CMOS BCD ProOr Tlm«r/Count*r 
CMD5 55? Timer (t pin) 
CMOS BaH Timer CM plnl 
CMOS Op Amp Compareto' 
CMOS OP Amp Ext. Cmvr r 
CMOS Dual Op Amp Camp. 
CMOS r r . Op Amp Cornp 



A 



Price 

]*-K 
24.99 
U.4S 
94.99 
39.99 
29.99 
11.4S 
11.99 
!J5 
12-95 



19.4 
9.1S 
13,« 
(JO 
1199 
17.99 
3.99 
11.91 
MM 

hm 

MM 

ZLtf 

1J.95 

10.99 

LL» 

31.45 

74.99 

4.45 

£05 

COO 

S.2S 

1.49 

240 

SMV 2.2S 

5MV 2.99 

SMV ),» 

10MV S.35 

CMOS Quad OP AnlP Com p. I0MV 7,50 
CMOS Ouad Op Amp Camp. 10MV 7.50 
Vol lege Conve r ler S.» 

Wiveform Generator 4,99 

Monpllthlc Logar.thmk Amp HAq 

SOppm Band — G AP Volt Ret, Diode 2,50 
Volt PJef/lndJcaior 2.95 

Vpit Bef/indnitor 2.99 



74CO0 
74CB 
I4C04 
UCW 
74CI0 
MC14 
HC20 
74CX 
74C42 
74C4J 
T4CM 
74C74 
74C» 

.^■:;^ 

74CI9 

74CW 
74C93 



J» 



LHO0O-2CN 
LMIOCLH 
LMUCLH 

LHOOTO-OH 

TL071CP 

TL072CP 

TL074CN 

LHQD12CO 

TL0KCP 

TL0UCN 

LHfJOHCO 

LM300H 

LMJAICN 

LM302H 

LM304H 

LM305H 

LM307CM 

LM309CN 

LM309H 

LM309K 

LM1I0CN 

- :■■■■: J .-.:.'. ■ 

UMJ32H 

LM317MP 

LMJ17T 

LM317K 

LM3ISCN 

LMJ1SN 

LM320K-5 

LME0K-12 

LM320K-1S 

LM320T-5 

LM3WT-12 

LM33QT-15 

LM324N 

LMJ29DZ 

LMH1N 

LM331Z 

LMJ3SZ 

LMJXZ 

LMJ37T 

LMJ37MP 

LMJH-K 

LM1MN 

LM340K-5 

LMJ40K-12 

LM340K-la 



UD 

4,ra 
4ja 



f.4J 

«-» 

1.19 
2.19 
X.K 



3-95 
L3fl 
LH 
1,75 
L9S 
1.15 
1,99 



74C9S 

74C tot 
74C151 
74CIS4 
74C1ST 
74C ISO 
74CI&] 
74C362 
74CIS3 
74C IS4 
74CI73 
MCI74 
T4Ct79 
74CIK 
74CI9J 
74C199 



74C 



1.59 

1-B? 

2-99 
195 

2.25 
1,69 



1.99 



74C321 
74C240 
T4C244 
HCJ73 

74C37* 
?4CMl 
74CM3 
74C9U 
74C912 
74C115 
74C417 
74C922 
74C923 

nam 

74C42S 

#)C99 

IOC97 



1.99 
2.29 
2.2E 
f.49 

2-55 



10.99 

10.95 
Ijfft 

10,99 
5.49 
5.75 
7,50 
7^0 



LINEAR 

LM340T-5 l.fS 

LMWM2 1,25 

LM340T-1S 1.29 
LM34LP-5 .75 

LM341P-12 .75 
LM341P-15 .75 
LM342P-5 .99 

LM342P-12 J4 
LM342P-14 M 

LM349N 1.25 

LMXOK 5,75 
)_!■ .yj\ M 

LF951N f.OO 

LFJ55N HO 

LFX6N 1.10 

LMXflN 1,00 

LM3HN 1,79 

LM370N 4.49 

LM373N 125 

LMI77N 2,99 



LM3I 

LM341N 

LM392N 

LM3S4N 

LM3«N-J 

LM317N 

LM3«N 

LM3S2N 

LFJ91N 

LM349H 

TL«4CH 

TL49SCP 

NES10A 

NE524A 

NE991H 

NE9J5H 

NE540H 

NE544N 

NE550A 

NE555V 

LM55SN 

NES64N 

LM595N 

LMMfiCN 

LM5&7V 

NE5T0N 



LM70JH 

LM703GN 

LMTOfiN 

UM710N 

UM7UN 

LM7237M 

UM7UN 

LM739N 

LMM1CN 

MC1741SCO 

LM747N 

LM74IN 

LM10I4N 

LMi3L0N 

LM145SCN 

L.rVl4»N 

UM|4»N 

LMt4*N 

LM1SSSV 

UM1K0N 

LM1S71N 

LMH72N 

UMU77N4 

LMUtSN 

LMltttN 

LM20O2T 

LM2I77P 

LM2I71P 

LM2M(P-l 

LM31KN 

LM14G0N 

LM390SCN 

LMJK9N 

UM34I4N 

LM34I5N 

LMJ91SN 

RC4IXN 

RC4353N0 

RC4144TK 

RC414STK 

LM4SQ0A 

ICL80J4B 

(-MIJGOON 

LMljaoflM 

75139N 

754BON 

79451CN 

75492 



1.29 
1-25 
IJS 
1.79 
2.95 
5,49 
5.49 



IM 

1-99 



CAPACITOR CORNER 

50 VOLT CERAMIC DISC CAPACITORS 



Value J* |o-44 K»» Value |-e Ifrto 100+ 

10 pi .« ,09 

22 pi .09 .09 

47 pf .Do .06 

100 Pi 01 .09 

220 pi ,C4 .05 

470 pi .04 .Ot 

10O VOLT MVLAR FILM CAPACITORS 

,001ml .12 .10 .07 I .022ml .13 ,11 ,H 

.OOMmf ,1? .10 JbJ J047mf .21 ,11 .19 

.0O47mf ,12 .10 .07 .Imf .27 J& .IT 

vOlmf .12 .10 .07 \ -2?mr .33 ,27 ,22 

20X DIPPED TANTALUMS JSoIld] CAPACITORS 



Value 
.001*1 F 
.OMJjjF 

&\uF 

.022*1 F 
.1UF 



-1/XV 
. 15/99 V 
.22/35V 
.JJ/35V 
.17/fcV 

.styxv 

1.0/35V 



JS 



1.S/3SV 

:.?/:5v 

13r3SV 
4. 7/25 V 
S.1/25V 
15/25V 
22/9V 



M 
JI 



.97 



.11 



MINI. ALUMINUM ELECTROLYTIC CAPACITORS 

Axial 1-99 100444 500+ RjdEfl 1-44 100-499 500 + 

.47flO V .It .14 

1,0/50 V .19 ,19 

3. 3/50 V .17 .15 

4.7/25 V -JJ -15 

10/2SV .11 ,15 

10/50V .19 .16 

22/25 V ,19 .15 

22/50V .24 .20 

47/25V 25 -21 

47/50V ,29 J9 

ID0/29V .29 .24 

100/MV .41 .37 

220r^5W -39 ,34 

220/90V .49 .49 

470/25V .54 .49 

1000/19 V ,79 .99 

2200/lfiV .19 .79 



.47/29V 


.15 


.13 


-47/50V 


,19 


-14 


LO/ISV 


.19 


.13 


i-fl/av 


4i 


14 


1.9/SOV 


.17 


.19 


4.7/16V 


.1* 


U 


4, 7/29 V 


,19 


.14 


4.7/SOV 


.17 


l r > 


10/19V 


19 


43 


10/25V 


,15 


.14 


ID^OV 


.17 


■ l f 


47j50V 
100/1SV 


.25 
-21 


-17 


100/2SV 


.25 


.23 


100/5QV 




■.1 


220/16V 


-29 


.?J 


470/25V 


.35 


.3] 



110 



CIRCLE 9 ON FREE INFORMATION CARD 




Is^lxjuctor Clock Modules 

12V DC 
AUTOMOTIVE/ 

INSTRUMENT 
CLOCK 
APPLICATIONS. 

* In dlth a,;TT!c::i! 

PJVelHAl 

* Aircfaf trrUf Ifll clkl. 

- 12VDC opar. Inttru. 

* Pe nab la/bat tary 
powarvd inHruTTinll. 

Feem ret: Br jQh i 0,3" green Uisylav- Imprnal cry Hal time 
Dal*, t 0.5 HC./dlV «CCUr. Auto.ditplaY lxipjhtri*» contra! 
logic, DilpUy color filterable 10 blue, blue-green. green & 
yellow. Complete -juit nod iwifCliej and lint, 

MA1O03 Module (3,cs"uxi.75"hk,»"D) . $16.95 



CLOCK MODULES 

WIAKJ23 ,7" Rod Oiflitpl LED Clock Module £.96 

MA 1026 ?" Dif>, LED Alarm ClOcLcrrharmDmaiBI IB.pS 

MA5036 .3" Had DiD.-i.tl LEO Clock /T Imar 6.95 

MA 1002 .5" R*d Digital LED Clock & Xfurmpr 9 95 

MA1Q10 .B" flti D: Q1 ji LED Clock 7,95 

MA 1032 CBA J" OiflLtil LCD Clock 17 95 

MA1043 7" Graen Dir/.Tal LEO Clock B B5 

TRANSFORMERS 

1 02-P20 Kf o.i 'wlflrMA 1 OZ'J, 1043 & 5036 Modi. 3.49 

1 02-P22 Xformar for M A. 1026 Cluck Mgduln 3.4y 

102 P24 Xlormqr Tar MA 1010 duck Mnrtuuii 3 49 



fC&zi Sun Power Your Electronics! 
*2gZ!& SOLAR CELL PANEL KIT 



Failure. 

■ OulpuE; 10VDC, le l pomA. In bftH 
5VDC, la 2WmA4n Pitititi 



■ VeHig* Irn* Up i." 0.5V H*ei*m«iti 

■ PnnlikMi for charging. bJltttfai 
* ChrH-iU pllMl U»: 

The JE30S Solar CalF P«rt*| KH sunlamp « *#ch tolar catla On if* 
uanal board art powi/t!rv#t>p£*)iich at low miuitr toid'Kltoliegei. 
\i"t voliaga at a i rr-oi irom 50 DC to iDYDC Tn* appipcmon* at paoh 
parial can to furl her expanded by coupling j rjrji I, in nl panels ■ r. 3*nBl 
fur mena railage or In piratic! iw mora currant, fha premluin gr«r* 
■Dler eel li provide thaturianl nbcaeaajy lor .Ji* dteia 1 iQn d most par 
labia translator radio*, jm#H t*i|*ry powered caiaetEe lap* pUfvi 
and unlxntilad *Koarl«nen[Bl aolar proiPEla 

JE305 $39.95 



EPROM Erasing Lamp 




■ Enifi 270%, 271S. 17Q2A. S203Q. 5204Q. tie. 

* ErtMiup To 4 chrpi within 20 minute*. 

* Maintain*, eanitaht *Xponr* distance of on* inch. 

* Special conductive- foam linorellminetai italic build-up. 

■ 'Built-in safely lock to pravantUV txpoiura. 

* Compact - only 7-B/8" x 2-7/8" x 2" 

* Complete with holding tray for 4 chip*. 
UVS-11EL Raplactmanl 3u4b $16-95 

UVS-11E $79.95 



JOYS 



JS4K 



T 

I 9 ' 



ICKS 




4 4VC-W 



JS-5K 5K Linear Taper Pols £5.25 

JS-100K 100K Until Tipe* Pott S4.95 

JVC-4Q 40K 42> Video Conirollar in caia . . Sfl.95 



MICROPROCESSOR COMPONENTS 



-eOflOAVSOBOA SUPPORT DEVICES - 

L9UA- CPU 

l» I BIE linHK^JulUut 

\\4 P-i 'ti ri1v Iflierrupl CrtMiLrl 

Ot Hi DlrKllanX Bvi Drfrar 

Pi ClarH OaraKeEcr/Drivir 

:.S Birt rii .. 

:ii iyiAim Con br rrfl*r 

IMJ I/O L*Mr>il*r I>di ajMiifl 

DM JMyi4NP9i>«ui C^min. t li*»»ni 

■1 PilM C«1IFI. HO DLlSftRTJ 

SJ 'ThM Inldivjl TjmM 

- . ■- • j Ffi r'niji ifa I' ■ i l i 

HP P|« cyAC*ilr«l 

■".« "':■» inmrupl C-nnnw 

m i-ii'« in: Cwt«i 

If 'h*! H«vaW*/CVial*f In1»rt»;4 

HI -54ll*Tt Timing [l,m,R[ 

B) I BH q- OimttiUniK RKiirar 

Hi I pit fr Oil tctteriM n«c*l¥H 

H * Bit B< D,|fc(-on.*i Hnilm 

:;: :• Ij . *' . •■:■■' I'^i-ip-K-tii Li .-. 

ILI CM til uiiiiJ P*. 1( ,.,i,ji cm* 

— pfiBOO/SBM SUPPORT DEVICES — 

iWCP UifUnith ■;: jrk md F(W 
UtlAPF I»llt*1iEAAH 

IU1 ftufMiii !■■!■■. *aini ;^cuv,;i 

IBB m .on|> !nEi>iiu»t CpMnii" 

MM Ll !«*■ I in ROM \ MCUJUbll 

|i|*l Ai-y liini on flu 1 tomra. Adiplir 

.;'..■ lifcmir.^.L hml D*ti Aiupm 

M« ;W:i^!^lil-.'.'l.M.V 

EH1 JW«H HOOlrliUll 

HBIA Qu la J SEiK 0"i Tr j ni. |UCITH1 

MICROPROCES$OR CHIPS 

flltCS CPU (MKHWI HWMl] 

fc 1 'K L, IP. |Wr;MK'i i\ \.»*.<< i,-| 

pibu C»v 
WAJ 

CP>U-t,ai1 S«-±» CCtKm.TapnD.U'*** 
UPu »;C et» 4HK □ v 1 »i M*A«iV! 

«Pv-i_ e „ HUhf] 

CPU-**. Chip I'BIA |jai&* til B AU| 

CPU 4Bt Q» I M MAM] 

,'"■ inn,!.L RAM 

CPU wjaauc Ultra intiraiitt' 



MM 

oma*iAoc 

MCH»I2 
iHHUiN-I 

'.LLJSif. 1 
HUHSN-f 

i^iajptiiN 



CPU 
MRf-WW 
— SHIFT REGISTERS - 

u-mjyn 1 D^,-,.: 
Dutl K fl 1 Qrn«nnlE 
thf il l«Bir ilUc 
SwIIU-Kl ^J-i'J »:=r 
JH-BH Dyft*mit 
JM* a-c Oyimi.r. 

OCUhH-tLT 
OlijI fee-BM 

IttK-ft Jjni-,! 

Hi- jj-i« ttttx 

Puil ,L" t<i i:ii.( 
;iM! Or-unK 



Duil FM.BI1 Slalit 
ij-ji Ain 1 Tim... 
□tut WD.l SUtk 

Qi^e r-o it i 1 -u l 

Flfa [OuilH] 

-DATA ACQUISITION- 

Lrni4*rijl *iii.« 'iPEir M"t 
T«v(h Tana pjh* Bj^a Fill« 
Tauth THi< '■.*!■ Una F>ll« 
iuaar Cj In O* * t.p 
i;a-i:iii Curra<n( iOu i c* 



ftr—icri 

AFktl-ICl 

AFLJI-LC, 

l-IHWI-i I 

LhOHZ 

LMUIZ 

LPaHN 

LCMh 

U'.'SHH T*-,s.Cetp Prii. f 

ADCDmL-CF^ a-BIl A/O Cw.iHr |1 LSB| 

OACiaa^CN 11 1 D,'* Canviri^r |i »-. LJrVJ 



J PIT IfiPul OP Afhb 



-DATA ACQUISITION [CONTINUED] — 

I HIE A/O Ctnmrlii nth Muili,] 
IBIE iVDCwwtirll Ci». Mu"[i ) 

is-aiii rv* c«iw. ui^a. cd— (a. {Lant 
H-anD.iAuCMw.MLup c-np ^nr.i j -* 

» BI1 OVA C»l»«'l« JlJtVi VII J 
PH1DW Covnvlar |*3ff»- Lm.l 
l.: mi lj.'-* fEKnitu Id 3?, |_lri,l 



*t>CB»WCCM 

Al«;ytl/ctJI 
□ •.CkWLC^ 
Ofl-ILIM'-C" 
UACS6W.CW 

HM ■« CH 

OlCl.'JJlCH 
CD*0iJ" 
AVI, Nil 



?iLi? m«'i sejsh. 

,'lll {till] >«4 tTll-E 

1H1 :*■' z.\ j- 1 uos 

MM ISKNi 5M1 It tJArtl 

IlrlL HB*il SUl IE aoni L.4BI «>e rtf 

Jilt!- MBt'iSmfefapni 

Ibl*L 1 hEMH* t,'ji It i-x-i. . t n « fenwir 

NUSt Mix I ilim 

'ii'-'Ul-.i'i'in KM u- f T*i"„, --y.i IMUVjari^; 

flllN'l HKDyiniT-iLMail 

MMjuii am* 1 fju wnt, 

HBI .-ij,< Hi'.,. 



I»l 

J- [41141 UK Cn-iifi.t lUrtl mr-i>i|K.]j 

IA trt Cyn, Hani Homir la *H M MABcUl 

■ IKAU in-s UK [IK M) Mil It 3Hfeii 

BIS U Bll rlAM 1 1trOC I 

UP04WVUri*l)| *K 0)rr»»mlt H-aln 

T VM9H-t|»rL i>' Link 

TMtaW MBM< Itiltc 

PROMS/EPftOMS 

WA ZK UV CriHai* PF40M 

™ in eprom 

TMUFM M>K tF P.Q.LI (4V. <iv .JJ'J 1 

.'Mll-iiili^llirr ilk-. P. PFic.1 ■! nut -1-1 
HBpnlilTI HKEPIIOW 

IK LP HOW [>ka>ni] [iiii'i tf/, 
MKEPnOMIHilaEM HtW)H| 

9JMPIU3H 

j], I 1-1"'- '•■ [Dpin Call*EE»rp 
*M* BiP«i»r PhoM 

JtM TM -Him ■ipMtr PAGM 

KPMOM 

Hl-JWiln^rJ m Cl.ir C|!|l«r 

■ ■ ROM S 

ajli3J«J tmn.nr Uimrjior lUapir Ciia; 



EBB 

l»JJ[T'SUi] 
IH1U 

«^3ii(P<uaii 
imn 

-Dm nMtv* 



n^iiBiii 



Cn«i*tTtP a*mtrjLiar 1 1.3-1.' cm) 
NMOS READ ONLY MEMORIES 

MCMfA^IDP m*i*> ASCI' SMrno */i5r,,< 

MCF^HMOP IHHftLil Will, JyrtQa. f P tLur*l 

HC MHiSiP JMhIji? Al Dhj. CsnEpai Cr,*' Um. 

MICROPROCESSOR MANUALS 

M-fH Uhi Mir-iul 
MCOPUH UMr Minual 
1 ■ :-. -ji wwr utpu*i 
SPECIAL FUNCTION 

LVU4< MQ1 Cla<« 0<i**h omTi 
DjjI HOB ClOfH OiiTii [IMZJi 

INStmN-[ Flpppv &;i; car," irjli, r 

I MUH1 N C«jnmunlejTlen Chip 

"■1 - 1 ■:■:!! 1 '-iji-iij- FJul ">■-.* Clack 

Uiitrap rptaiKH- C*mpi(ib-lt C a ( k 

MocroEentrallir *..rh UDIilr RAM 

>-'■- DIPKI , ie r- ,. 

'-< ■ ■ c : ^.' 1 ft-i *' ■* ]■ f 1.1-i 1 RAM 

P ::■:■■:.! LtDOiln .-;■. Buu Int. 

COPHBM B>Iafl.V AC Flupr. Cm I . ■ r DO-pIn q l t ] 

TELEPMONE/KEVBOARD CHIPS *— 

AY4HHH Puih Puttan T<U«b«iimk Crllbar 

A v-i-jne PIVEHTtarr D<i II 

AV44W CMOS Clack aarvvrHflr 

•.■:::-. ■ «..- .- jj- 1 .; ^ ; , ;J .. : ji ...■,■>: 

m:::::--, <.ivn:.i'3 Entadii- iltl h*v*t 

;4CHS :■.■., ■:■;,!■;! ■■--.-■■■::..*. t- 

MCfZl ..MtJiu-.ni:^.. ;;;ii,i: 

MMUlHrt Puili Bultan PuJu □,<:«, 

MU1NHPW *J«.K*h,S4-lj| KtVBI 



LOMt-H 
COAtQTMPt 




RADIO GONTflOL CIRCUITS 

idHl lo- rimcf* con-lrsi n/|[«rnt *h4Ti irt* (him «me.lirv4* ndtfuliCicn Hot cm, boaii. 
i±r.it3 ttc.i FMlMrti 1in Il-heIw cantm. adiututa* liirti'irvs i-ji* iinlAolp Iw jr und 
*JUH? t nit; i ind low ct «*■ EDniUTiplloq 

KB-442A TRANSMITTER 1+.25 

^ 'jrmiv «ji- vi»i >1VDC Port. Dlttipal^t PO: 3» "' 

13J>hC FUlOTITVHlS+3 q S -fl Vftll 7. 



Ac» mii lilinn a**25*C'l Supplj- vd1 Vcsl 1ZVDC P**-*' Dlttipaltn PO aMmVc. 
Twipp. r-iftrt. Offf 0- - WC -. S-cri(* Kl 
fryitll tv Cfl. 0Kl"*l»ari «Hr«yl1i ActipluHi 



Me>44±g RECEIVER Ju,*5 

Hf, mit «j! 3 = rTAo??^:i Suppty *mi Vccl HVVccI; fiV P*MM" DhpipiI'*3 MOW 
Ttmci rinQi' Or* ■ MM nwerrHTdrtM ocw pdJL. VOPl J "V - VOR 3«v 



ALLIGATOR CLIP TEST LEADS 




MMvy-dtily itedi. cojot codafl insutpifltJAHHjHof e lip on ucn ino iff" 
long Two *acH black, r«d, blue vrhita and pillow. 

#ALCP (10 per pack) $2.95/p1<g. 



^iaaaV- 



JE215 Adjustable 
Dual Power Supply 

GenunS OEicripimn: The JE215 a I Dual Power 
Supply with independeriT adjuiteblE pasirive end nega- 
tive output volteget. A sepifite idjuttment for each 
nf the lupplies prnwidtsilie uter LtfilimiterJ applicalirj-ns 

for IC current v,.iN._.. i r_ rcquirtinefiii. The supply can 
tljo be uteri « e general all-purpose variable power 
supply. features 

■ A t! ; ,j i : a ti I p r a rj-j | BTBd p ,va ' %u pp I ■ c i. 
pes, *nt* nag T.2VOC to 15VDC 

* Ppwar Outpbi IlKh Itipplyp 
BVDC m SOOnriA, 1 tjV DC » 1 50m A , 
1 2VDC a> 500mA, and 
1SVOC* 17Stt,A 

* TWO. 3 TinTN.nai H.l| IC I < rju U ■; Qf! 
witf» thariTiBl ovarlOad rirnlpclipn 

* Hiiciin'. P'agulpior cooling 

* LED "on" Indicator 

* Printtd Board ConitructiDn 

* T20VAC input 

* Sua' 3 1/2"ipv x 5 l/lfi"L * 3"H 

JEZISAdj.DmlPowarSuppty Kit (h shown]. . S24.9& 



'** 



t Pic tufa nOtthQ^h but *imllpr in con*1ruc tian to ittuviif 

JE200 R« r Powar Supply Kit 1SVDC, 1 tmp> , , SH.95 

JE205Adaplaf Brd4toJE200J ^5,i9 8r tl2V. $12.95 

tJE210Vif.Pwi, Sply. KiT &-1&VOC !ti1.5jmr>. SI 9.95 



JE608 PROGRAMMER 

27042700 EPROM PROGRAMMER 

OENEfUl AFPLI0AT4OHS: 

* Tu aroorpr* EPROMS m* artd int. 

• Dawli;uiii*rtlii i]iit*ni i« rmtrs* vnpm l*r t"*ylli 

■ To n«l ih* centpnt* ef ■ pr*-pfoor* miw i J EPflOH 

' Te cgmu/i fPROumj l*r flWlH*! *ll«*fK« 

■ To i/r.ul.iH a pwetpnwntd EPHfJU 
■■ T» U» piognam In RAMS l^r ill.tutism 
» Tiwm ippi/iii DpmAh P:*jiii#rp i LDnj rui n*, 
Raf in1.ni i, ia LED' 1 47" i-;, Ih Addrai i Hagl Ltn t rut J 
LEE/i (or DjIi Mamory Atgi^ar Thi Dili H« rr.fi r, 

naglilar dliplayi Eha contanl at 1ha RAU* Horn IJia f PROM Chip. 0««4lOP>TWII Of 
mini ol a ribbon cibla 1rom Ihi prDoriiTwnir pinal lail lockat le 1ha tPRQM (otk^l 
board. Ripld ctwcklrvg nrhkallwi ol ptograrnmad dill chincai. Hatt niay nwedPEl 1 
« wrlla Inlo RAM' i wll hi kn-t»nd anlrLii. Allowi manui 1 1 tapping m j.nlpulj tlan {up ind d 

I EPHOH PrDorimmw cotulillrmoT: A. it I*, ttaki^filmul y.a f ba»/d 
■ wllli i poatr lupphu ir*f ■ LEDiTaH SociH Piiwl Board juimbJj 
hart* taqakamanta: liWAC. HKt HC CoflqLfct o*»li 




rnksrepfMaifor lytlam* by 



irrtitfrleFlrYM'l 
ee*n'*t 111 wHt'tf 
' MMHiaJf,. Pioaram- 
i. T ha Tt*1 E«eEa1 It 



j4»:e^p> frrpttm* Fv a* epwirpw Th« EPftca* c*n b* artqumnvd dwn tr* 

preoWFuntd f PROM Tn* JHraj Ptvfrarmr •nn pnvltrta a prggrcmnKi IPROM trr 

Th*»a*iei*ih|yta<ieii*5e'p't1IW*pri>fl(*i3ile*aPr^lf^. r=-*> 53. pr pcnf™r;ro i r.h, 5 Any 



JEBOflKKIt 

JE60BA Assembled and Tested . 



IH^U «7Ufrj" t,H[. 



. S399-95 

.S499.95 



JE6JD8-16K ADAPTER BOARD 



0ENEPUL DESCRIPTION 
npjj LOW IV .^3:z-r: leani*:^. ih.j 
7*e.lPR0MS Tha*aap1a.c^rvs«rcf*: 
■ o(0,ih»|PB0M 



FOR 2716/2756 EPROMS 



Vm T' brt and atao 
oa 1ha STUS 1 1KI- EPROM •* «m 
IOMkBI d IN* [W0M t>K»4H D4 im piatiTfl fk HAM eppacitr in Eha JEtOI ProfltarMTW 

JEOGfl 1«K Ao*p»f Board Kit 

JESM-Upgridt (Send a&umbhd J E60B lO (oCtory for adlptaf insttlbrion 

rjl lrtrj JEWe-l6K Adaptor Board Kill 
JESOflA-lftK Mod. Attornbled JE609v*/Ada.pttr IJECQe-ISK) Irn-tallad 



roDgcri EhaZneand 



129.95 

SS9-95 



51 0.00 Win. Ofdar - U.S. Fundi Only 
CaILt Rtvidaintf Add E% Salai Tax 
Poit*9*-Add 5% pli«S1.50 Imuranc* 



Spac ShHtt - 2U 

Stnd 66* Postaga lor your 

FREE 1982 JAMECO CATALOG 




J a 
Mi*ii.MiiMa 



PHONE 

ORDERS 

WELCOME 

(415) B92809T 



MAIL ORDER ELECTRON KS - WORLDWIDE 
1355 SHOREWAY ROAD, BELMONT. CA 91002 
11/bi PRICES SUBJECT TO CHANGE 



BOOKS > 

Naupnpi semlepnchjelef — lirtarril - invaf 
MOOt fipEleial CMO» Oaip look mM 

IBApapaal 74C, CLXCW. and a.'O Convtrftn 

30002 Npdo*aHn1apTac>DBl»l<Mfc *•-!! 

iW paoHl OP, OSSlYJQ, DS3WO. DSreOW. f-i 

Na!lo«alUni*rDauBeOR **.« 

HJH paoHl LM. UP, ADC, DAC, LH 9«t*a 

HaPOnalSw^tD - BoiMILaval Com|>ul*r IZMnasaa) MS 

Mali r>naJTTLL*akt P»W ifrsA »■.■ 

l&tpaOMJ T*M,i.S 1 L 1 _H J 5 t and" OMKC0 Striaa 

3MW p iff ■Mr^mWBIJJaa a art H1«.'lp.c 

3Q0Ot lBi*riJEOitjaoo4ill07*paoi«l **-** 

010*00 mi-i CenipenanTOita C*u>le« 1-10.00 

Ful dila ahaati Idt kilal'i prcrfudi thd. fnamorv oa wo w. 

mteroeroe, ppnpha«l» h***m fmi prodvEU 1 1321 p*a**p 
20W10 lnmParVp+*TaJO*tlilBn»ilbeofc ,, *7-H 

Fwl dtTla ihaati, ippt. notn tef InM p»<ipha**l 0¥M* 

t o t i ' iwna w i Ttw paowi 

AC and DC Wall Transformers 



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l-„ t:H '.r I 41 AC H 



Part No- 



'fit m 

AC BOO 
AC 1000 
ACI7O0 

OCdOO 



Input 



117W6QH* 
117V/S.-DH; 

1 17V/6DHjt 
117Vp r S0Hi 

117V/6QHa 



aflga 



n VAC25qrr.A 
13 VAC 5DQ.-nA 
1? VAC 1 amp 
VAC 1.7 amp 

9 VDCaOOiriA 

o v:::c Bpainfl 



S3. 9 ft 
S4.S5 
SS.AS 
S3.SB 
S3.2G 
S3.95 



CONNECTORS 



DB25P OSufammiBluffl Plug S2.9S 

DB25S D- Sub mm I iUK.fi S«kit $3.50 

D20J1S.J Set™ Lock Htl*i, 121 D B2SS/P I/S.M 

DB51J26 Cov«r far OB25P/S S1.7S 

JI/JJSE P.C Edg> 122/44 Pin I J2.9S 

UG3B/U BNC Plug SI. 79 

UGBB/U BNC Jack 13.79 

UG 175,'U UHF Adnpter $ .49 

S0239 UHF Pantl Rbcp $1.29 

PL25B UHF Adapttr SI. GO 

PU259 UHF Plug $160 

UG2S0/U BNC Plug S1.79 

UG1094/\J BMC BulkhMc Rkp $1-39 

TRS-80 
16K Conversion Kit 

Expind your 4K TRSB0 Syiipm to 16K. 
Kit ccmitcomplel* with: 

* 8 ». MM5290 IUPD416/3 11 Gl IBK Dyn. Bimi I'NSl 

* Documentation for Convarsion 

TRS-16K2 '1B0NS $29.95 

TRS1BK3 ■2fJON$ S24.9S 

TR5-16K4 -260NS $19.95 

JE610 ASCII 
Encoded Keyboard Kit 

i 

Tr-.p JF-&1& ASC'I Kaybeard Kit can ba inrarfacod iiics 

■tiott any cornpuiar fviiam. Th* Kit comti comploita 
vulTfi an IndutErial oreda kaybuard -rwlltch PHannbly 
{SS-kayiL lC r t, lockaU, connector, ♦nctrgnjc compu- 
nont* ami a Ooub I abided pr^rtHd wiring ecafd. Th# 
kvyboard aiaatnoly raquirai +5V 9 .5QrniA and -12V 
;- 1tj m a for pporaLon Ftiiurn 60 kayi ganaraia iha 
136 r; h j ra c".a r i. upper and lower ca*a ASCII hi. Fully 
■juirarad. Two ui*r-d*fina kayi orovideo for curton> 
applloailont. Cap* took for uppar-catP'ornLy elphp cfipi'pE. 
lern. Ullllret a 23-7S 140'plnp anccidar road-only mtrrorv 
chip, Outputi dirattly cumpatibl* with TTL/DTL or 
MOS logic array*. E«*y Ir-iraf feeing with a i& pin am or 
KB pin adgaconneeior. 5.-a: 3H'*H * 14!-i"W xBV'r; 

JE610/DTE-AK j.X'.'J?™."! ...S124.9S 

irr-^i-i i>Eib t;-Key Keybojiro, J'C Bojira. « -,„ nr 
JtD \\J Kit 6 Cc-iinonenVa |no C«») S /9.:Jb 

K62 R-K«y Kayboerd IKayboard only! . ■ S 34.95 

PTE-AK (cam only -a*i"H)tU"W>dJV t Oj$ 49,95 

jtMMi JE212 - Neojtiyo 12V0C Adapttr Buard Kir 
fNEWEl far JEG10 ASCII KEYBOARD KIT 

J yw V ^ i Providei-UVOC rrom incnmingbVDC . S9.95 

JE6O0 
Hexadecimal Encoder Kit 

FULL 6 GIT LtaaaaX 

LATCHED OUTPUT ^ft ^E^aam \ 

19 KEY KEYBOARD ^^ ' ^^b^bW \ 





The JE00O EncodBr Kayboarni Kit provldai Iwo Hperat* 

hexadacimal CtiSltl producad J rum ppqupnliB' *oy antna« 
to illCw dJraCT P fO^r a '" n% i n Q for fl-bit rn.crc.prpc«iiOI 

or 11-biT memory cJrcuiti. Tbree addinoinal key* are pro 
virJod fpr uicr uparatiso* with unt havino a Oitipnlo 
uutpui available-. Tha outputi «ra iBtched end monilurad 
With LED reedOuta. Alas mcluiJad in kav ancry lirumi 
Faaiurai: Pull tj-bli. latohad quidul for fn ic r up rti tenor 
liiv, Three uaar'dalifia kayi- with one bainp blitabla 
uparetipn. Depu'-ince circuit provided for alt 19 k*yi- 
9 LED re>deuti to verify •ntflat. Ea>y lntRrfBclr»g wi.ih 
standard 1S-p in IC connector. Only tuVDC raquir»o 
for sparailon. Siaa: 3"i"H x aii"W x HV J D 

JE6Q0/DTE-HK ^IJIVS^^ ... $99.95 



. .$59.95 

K19 H-Kay Kayooard {Kayboard only} ... . $14.95 
DTE-HK [cau only -ja"Hxl«t"W>aUfc"DI $44.95y 



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CIRCLE 9 ON FREE INFORMATION CAR0 



111 



PLANS & KITS 



s 



POLICE /fire scanners, scanner crystals, anten- 
nas, radar detectors. HPH, Box 19224, Denver, 
CO 80219 

TELEPHONE or office bugged? Latest detection 
equipment finds out fast. Literature $1,00. CLIF- 
TON, Box 220-M, Miami, FL 33168 

FREE speaker catalog! Woofers, mids, tweeters, 
hardware, crossovers, grille cloth, plans, kits, 
Information, much more. Discount prices. UNI- 
VERSAL SOUND, Dept. RE, 2253 Ringling Blvd., 
Sarasota, FL 33577, (813) 953-5363 

ELECTRONIC portable air cleaners eliminate 
99% pollen, smoke, dust. Free catalogue. LEC- 
TRONIC SALES, 3338 Rollingwood Drive. Wood- 
bridge. VA 22192 

"TOP *eer»t" Registry U.S. Government Fre- 
quencies! 4th Edition! 120 Pagesl 50,000 latest 



scanner listings: FBI, Secret Service, FCC, Cus- 
toms, military, etc. $9.95 + $1 first class mailing. 
CRB RESEARCH, Box 56-RE, Com mack, NY 
11725 

SAVEI Calculator repairs. Most failures fixed by 
hobbyist. Troubleshooting/repair guide. $3.75. 12 
Sandalwood Rd., Dept. R9, P.O. Box C-5525, So. 
Burlington, VT 05401 

RECORDS-tapesI Discounts to 73%; all labels; no 
purchase obligations; newsletter; discount divi- 
dend certificates; 100% guarantees. Free details. 
DISCOUNT MUSIC CLUB, 650 Main Street, PO 
Box 2000, Dept. 3-1181. New Rochelle, NY 
10B01 

SAVE up to 50% on name brand test equipment. 
Free catalog and price list. SALEN ELECTRON- 
ICS, Box 82-F, Skokie, IL 60077 

more dassifitd on page J 16 



SPECIAL FALL SALE 



15* OFF ON ALL ITEHS LISTED IN THIS Atf 

with order of J25 of morel 



Sale Is in effect from Oct 15 - Nov 3D 

United to merchandise in stock 



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INTERNATIONAL EXECTRONICS UNLIMITED 

41i HBT 5T. iol.M). :i. I34K 
EthMM K5 «i 2747 



FUJITECH AUDIO KITS 



LATEST AUDIO TECHNOLOGY 
FROM JAPAN 
Modal A501 Power Amp 

* Pure Class A 25W + 25W 

; Switcnabfe to Class AB 100W + 100W 
' Switchable to Bridge Class A 100W mono 
' Switchable to Bridge Class AB 3O0W mono 

■ Frequency Response 5-200KHZ (-idB) 
" Sign alto-Noise Ratio 120dB 

" Non-magnetic Chassis 

* "Out-board" comprehensive protection 
circuitry 

" DC circuitry with limited use ol NFB 

■ High Efficiency Fluid Convection Cooling 

* THTJ under 0,007% 




$299.00 



Model A 502 DC Stereo Control Center 

' Direct DC coupling tram Input to Output 

' DC servo circuitry 

' Cascade FED Input in ail stages 

* Separate Moving Coil RIAA amplifier 

■ Distortion below 0.005% (3V) 

* Max Output 1SV 

' Frequency Response 20Hz-20KHz ±0.2 dB 

■ Maximum Phono Input 

MC = 16rmiP,MS(1KHz) 
MM <■ 270mv RMS (1KHz) 
" Built-in Headphone amplifier 

■ Relay Output Muting S349 00 




$349.00 



Model A1033 Integrated Tube Amplifier 
' Latest Japanese Design 
" Distortionless Output Transformer using 

special winding techniques 
' Most circuitry on PCB for easy assembly 
and humfree performance 
■ Output 30W x 2 Ultra Linear 

(Switchable to Triode) 
15W x 2 Triode Output 
(near class A performance) 
' THD under 0.4% 

" Frequency Response 30-30,000 Hz [-1dB) 
• Separate Pre-Out and Main-tn only 

$499.00 



<•<•(• t* - <- - 



$499.00 

Send $5.00 for each assembly manual, 

refundable with order. 

Monarchy Engineering, Inc. 
380 Swift Avenue, Unit 21 
South San Francisco, CA 94080 

Visa or Mastercharge acceptable. 



112 



CIRCLE 47 ON FREE INFORMATION CARD 



Builders! Check These Great Values and New Items 

Available Now at the Radio Shack Store or Dealer Near You! 



Video, IF and FM Defector ICs 

BrcW! B £ 

Low As 
T» JTTTTTT 

Ideal for Building Receiver Circuits! 

S MC1330 Video Detector. Fully balanced, high linearity. Video 

and AFT outputs. With specs. 276-1757 2^*9 

IB MC13S0 IF Amplifier. Built-in AGC. Usable from DC to 

60 MHz! For video and audio. With specs. 276-1758 2.19 

© MC1358 FM Detector. IF amp (100 kHz to 5.5 MHz), limiter, 
FM detector, audio driver, 14-pin. 276-1759 1.79 



DIP Switch 



149 



■ III 



TTTT 

Fits 8-Ptn DIP Socket 

Four-position, ideal (or digi- 
tal projects and low-current 
applications. 
275-1304 1.49 



Hobby Motors 
NEW! 




Pkg. of 2 



Ideal for models, solar- 
powered projects, or as low- 
voltage generators. 1 V4 to 
6VDC. With gear. 
273-219 Pkg. of 2/99* 



DIP Relay 




Top-Quality LS ICs on Sale! 

* Faster Than TTL * With Pin-Out t, Specs 



Actual 

Size! 



Fits DIP sockets or PC 
boards, measures only Hx 
Hx 7 /i«"!5VDC,56-ohm 
coil. SPOT contacts: 1A @ 
125VAC. 275-216 ..,.2.99 




Microwave 
Diodes 

-199 

Pkg. of 2 



H-P 5062-2835. Manufac- 
turer's prime! Low-noise 
Schottkys with 1 pf max. 
capacitance. 
276-1124 1.99 




Description 



Qujd 2-lnptrt NAND Gate 

Quid MnptrtNOR Gilt 

Hb Inverter 

Quid 2-lnput AND Gib 

QaidMnputDRCae 



Duil flip Flop 
tBitBi-sticSUtrti 
Decide Counter 
Fielriy. MonQsUbta 

Mhibfiior 
1 orlSOccodn/ 



4-Bi nay Counter 
3-E-l Shiil Rfjisler 
Quid D Flip Fop 
Up/Own Biniry Counter 
Octal Inverting Bus. line 
urwer 



OcUl 3-State Ntm-lnv. 

Driver 
OcUl Kon-in. Bos 

Trinsumr 
Ku Bu"(i 13-SSiHl 
Mai Olaltti, fill 

tnrovjli 
Octal D Flip flop (Edge 



Type 



74U500 
74LSM 
74U3M 
741S08 
741S32 



hlsm 

74LS75 
74LSM 

74LS123 

74LS138 



741S161 
741S1W 
74LSI75 
74LS193 

74LSM0 



74LS2J4 



74LS245 
74LS367 



74LS373 
74LS374 



CM. No. 



276-1900 
276-190! 
276-1904 
276-1908 

276-1915 



Z76-1919 
276-1920 
276-1923 

276-1926 

276-1939 



276-1931 
276-1932 
276-1934 
276-19% 

276-1940 



276-1941 



276-1942 
276-1635 



276-1943 
276-1944 



P.t; 



.79 
.99 
1.08 



1.19 



1.39 
1.39 
1.19 
1.49 

1.99 



1.99 



2.99 
1.29 



2.39 
2.39 



SALE 



St 
"■ 
.39 

1.19 

.99 



1.19 

1.49 



1.49 

1,99 
.99 

1.59 

1.59 




IF Filters 
NEW! 

Only 



1" 



Pkg. of 2 



SFE10.7MA5-A. Quality ceramic 
filters for 10.7 MHz FM IPs. Input/ 
output Impedance: 330 ohms. 
Bandwidth: 260 kHz (3 do). 
272-1301 Pkg. of 2/1.99 



Computer 
Connectors 



^99 




SI D-Submini Mate. Plugs into 
RS-232 jack. 276-1559 ..... 4.99 
LH D-Submlnl Female. Ideal for 

extensions. 276-1565 4.99 




Build a 
Power 

Supply! 



Steel frame. 120 VAC primary. 
Center-tapped 18VAC secondary, 
rated 2A. 2¥tx2V*x2: 
273-1515 6.99 



Magnet 
Wire 




^49 
Set of 3 



Ideal for Winding Colls 

Assortment includes 40 ft. of 22- 
gauge, 75 ft. of 26-gauge. 200 ft. 
of 30-gauge. 278-1345 . . Set 4.49 




Solar Cell 

new: 
395 

New 2,5x5 cm 
polycrystai line-type 
cell, 0.42V typical. 
Max. current: 0.2 A. 
276-124 3.95 



D to A Chip 

NEW! 

449 

Put Your 
Micro to Work! 

DAC801. Produces up to 20V 
peak-to-peak output with 8-bit digi- 
tal input. 16-pin, data included. 
276-1791 4,49 




DPDT DIP Relays 
d 49 

^Each 




Now— PC Boards 
In 2 Steps! 



Fit 
16-Pln 

sockets TTTnn 

12VDC, 280-Ohm Coll. Contacts: 
1 amp at 120VAC. 
275-213 .... 4.49 
5VDC, 50-Ohm Coil. With fea- 
tures of above. 275-215 4.49 




NEW! 



>49 
Set of 4 



Dtrecl-Etch Dry Transfer*. Just nib 
your circuit (strips, circles, IC pads, 
etc.) onto board .. . and you're ready 
to etch! 276-1577 Set 2.49 



Let's Wrap! 



B 



1 



;95 



- 2 



e 

39 

Each 



Hi-Style Knobs 



rapping 1 

long, metal. 276-1570 5.95 

ffl 30-Gauge Kynar Wire 




Color 


Cat No. 


Color 


Cat No. 


Red 
Blue 


278-501 
276-503 


White 
Yellow 


278-50? 

278-504 



Pkg. 
As I of 2 

El Two-tone "top hat" for W 
shafts. 274-423 . . . Pkg. of 2/1.69 
H Neat "metal-look" for W shafts. 
274-424 Pkg. of 2/1.89 



Adjustable Zener 
jjBjjP NEW! 

TTTT 1 89 

2.S to 36VDC Range 

TU31. Will sink 1 to 100 mA. Use in 
voltage monitors, series regulators, 
over-voltage protectors. 8-pin with 
data. 276-559 1.89 



Stepped 
Controls 

Only 

199 

I Each 

• 41 Detents 

• W Shafts 




Value 


Cat. No. 


Value 


Cat. No. 


Sk 

10k 


271-1730 
271-1731 


ICOk 
500k 


271-1732 

271-1733 



z 
o 
< 
m 

00 
m 

30 

-j. 
to 

DO 



Why Wait (and Pay) for Mail Order? 
In Stock Now at Our Store Near You 



Retail prices may vary el Individual stores and dealers. 



Radio /hack 

A DIVISION Of TANDY CORPORATION 
OVER BOOO LOCATIONS IN S3 COUNTRIES 



CIRCLE 3 ON FREE INFORMATION CARD 



113 



v^AEMVNCED— — 
Y Zr=^COMPUTER 



FIRST TO OFFER PRIME PRODUCTS TO THE HOBBYIST AT FAIR P RIG E SI 

1 . PrOVen Quality Factory :ested products only. /^sTT"^ 

2. Guaranteed Satisfaction ( 4jef 
Call For Special School Discounts XfTs.j 




o 
z 
o 
cc 

& 

LU 

_l 
LU 
i 

o 

a 
< 



114 



Vista 

"V-DRIVE" 

THE LAST WORD IN 8" 
aOPPT-DISK ENCLOSURES 

TOe'lflSTA V-1000 FLOPPT DISK MIIE SUHYirEU 




DISCOUNT PRICES 

1 385 

ifM**m<m**l&**tPtl&B S1495 

BMHdMi[nwv»w>nlitidi S1995 



EMMET mr. 



fdr TRSStPMODELI, 
PMC 8ft "ZENITH HB9, 
S-100, etc. 
ONLY310 00 ea. 
MODEL V-801, 
80 TRACKS, SS 
ONLY 425 00 ea. 

2 OR IV E CABLE.. 29.05 DRIVE CABLE . 1B.8S 




#MOSTEK MK4015 
4K Dynamic RAM 

< ' Refresh while supply lasts only .49 c 
Pin ffquivalo-nt to MK4027 except has 1 rns 



*0^ 



S-100 WW 

$2.99 each 



FIRST QUALITY AT SURPLUS PRICE 



2708 EPROMS 

PRIME-450 Ns. 
3 for $29.95 




4K STATIC RAM SELL-OFF 



TTTTTTTTT 



Zllog 6104-4 



Same as TMS 4044 but designed specifically 
lor Z<80 based ayssems. This is lull-spec 
4KX1 RAM. 450 Ns. 

While supply lasts S1.49 each. 



SPECIAL PURCHASE 
$59.95 Limited Supply $59.95 

15K Altalr RAM Boards. Fully Populated as is 



£&% 



FLOPPY DISK DRIVES 

QUME* [>in;f4CK ! 
' thaubla G'cftd 
+ Oauhl* Dmnly 

ACP LOW PRICE $569.95 

34*94 

739.94 

795 00 
44100 
41MKI 

n«O0 
1+900 



TiiHfcm TH10O-1 3*"* Oil*. Drlv*.. 
MPlBSiV,". 40 tiiiiki . 
3+HP}4rt SA400-S V 34 Er«0u|. . . . 

StaOlilKO/Hlfll' 

5*Tiafl.i Sfcugat C*mp4ii,bl*i i4odH FOOl 
PUflSCl MoJiJ 277 Dv4V 

MPI 842 SS" Dull 

WAHC-O 5. LXDM& 52 

MPI 91 Doubl* Tn>Ch Dimrity Sintjl* Sd*> SO Tuck* 

MPI 42 OOubl* TnckDtnUty Ckaubla SiSb. 180 Track. 



I3D-BD 



:m: 



(jaOO MICROMODULE u PRICE 

WODELNO DESCRIPTION 

S-SOOA SJifll* HWxd M*fccsmp«!»r J 

&60& WrtKM Siruji* Sd Cgmo jUOSp 

0401 16 Stol Moiktr Baud 

Curd Cog* - 

a Slot M r |h« ■ B«rd 

f ■:**■' SuO0i> 

DC inpuj Pow*r &upp^ 

Ul,l,!> Ptq'd Ek-J I j 
AftHl Proo'Momofy Hodul* 
&jH*yed UM.Ey Prof o Board 
32 K £PFtOM/RAM Module 

EPflQU Proar41|iinu*j H*M 

15 Ohiwwji: P>rpll«l I.TJ tffflS-Jlh 
S#r.j:-. C a i *>■*'■ 1,-iQ Modulo 

1 6 K 5eai< HAM M :-j : a 4 ■■;.-". 
32K Sfal-e RAM 4S0n.s. 
32K Static RAM 2O041 
•Ci/d Exlf nrJor 

M i»irip!e Piog rj rrim jt;!f Timor 
B Qnnnil fr- Otn SAtJl I O W zna 
IflWHQtHii Tape Corral*' 
ai/32 I O Meov* 
Cvhlact CtJlLirf Module 

UtSFO^L/LAreTD flCJAffDS JXIw Aratrab/al 



9*03 
=MQ3 
B40- 
9405 

s&to 

9011 

9fi12. 
Mi* 
W17 

9E20 
M27 

■>5-?0 

9*20A 

9430 

9440 

9*50 

9455 

96103 

«70? 



LIST 

pfliqE 

sea co 

175 00 
7500 

100 DO 
WiOfl 
3?S 00 

3.3 M 
49500 

49 O0 
35000 

250 00 
7 3 5 00 
3 MOO 
3«Q0 

595 00 
A95CO 

eaoo 

iOl. CO 
395 00 
540 GO 
273 00 
350 00 



$24.95 TRS-SO/APPLE S24.95 

MEMORY EXPANSION KITS 

4116's, 16K (200/250 na.) 

1q ■/ 8 pes lex S24.95 n AM 

h K Specify Campuler U A lyl 

^^ " * Ca.H For ValumE; Pr.cjnirj ■ ■ " ■ f ■ 



CENTRONICS PRINTER 

UodaE 737 

* OffnEronscs compfeto pnnicr 

* Tho 7 37 has ivurjnirHrtu CJikk 
aixf compjie 1rn; realurA^ 

« r/«W ICM. pnco $03&.OO 




32K STATIC RAM BOARD 

2 or 4 M Hz Expandable uses 21 1 4L's 
S-100 

'..■> ■■- Mn.-p .i ..1&9.SS 




6K4MKIAST .J17.95. 
.33K-MH^Kil .,289.95 
32K*MHiAiT .339.00 

Bars Beard! 39.95 

IJjt il:l -.V.-L..I piTlS 
'0 5 3 T cm .99.95 



NEW! from Zilog 
z-8 CPU comes wfih 
Tiny Baste &, debug 

program ori the I.C- 




BIPOLAR CPU SALE 

Signetics 8x300 8 bit CPU 
While stock lasts 14.95 ea. 



UV "Eprom" Eraser 

. Mod*EUV»-1iE $Efl.V5 

| Holds J Eprom ■; al a i-mff 
f BacHcti ty,- db vears 

Modal S-S2T... $325.DO 
ilfial WorJei 




NOH-LIHEAR SYSTEMS. INC. 

10UCH4-|CST 20 

DIGITAL »„..„.. 

MULTIMETER $319" 



(£ 



* BECKMAIM 
<$? DIGITAL MULTIMETERS 

^„5> TECH 300 Digital MultlmBMr. . . . P -SllO 

^ TECH 310 Digital MurtirTi*»r S140 

^ TECH 330 Dkgilal MuUimatBr 5189 

J<\ VC-201 Vinyl CSfryinDCa" J 10 

l j^\ DC-202 Dt'lux* Carrying Ca» 52* 

V l\ HV-211 High Voliag*Probff $35 

T^Ahp-22) RP Probe J3b 

\?^Ct-231 AC Currant Clamp »42 

DL-241 DalHue T«t Laad Kil *10 

TL-241 Sa^are Tint Lcadl 56 

INTERSYSTEMS 

The Preferred S-100 Box 

The new Series II CPU Board teatures a 4 
MHz Z-SOA CPU and full-fealure front 
panel. 20-slol actively terminated mother- 
board, vrllh 25 amp power supply (50/60 Hz 
operation, n-cl. &S cfm ian|. 

DPSt, List $1795 




SYSTEM IA 

With Z-BOA CPU 

MHz. 64K HAM, HO Board, 20 slots, front 

panel, double density dish controller 

board. Full 1-year warranty, 

Li3iS3795 ACPPrice$2995 



B 



NEC 

PC-8000 Serin 
Micr ocomputer System, 

^| NEW 

INTRO 
PRICING 
$1099.00 



■ BJ ripyj, *i(n rnkriiflti tmypad 

■ iCfliiw rnoiulion 

■ SO chaiKitr acaan 
PC-OCO iA M ici cnon p. u i at w.-KKRAM 
PC-BD12A 10 Urn! *,'12K RAM.. 

fTJiv.vJ-!'. 

PC i»J ia Oui' m inl fji»h Or, k4 unt i 
PCB032A AdJ Or. CuJl Win, Diik 

DriXiUnK 

PC8051A'm3jjci MiLii> Ptin^r, 

Tr«1o^Frn1 l&n F«*d 
PC a«^ACi5*«i 'or PCMJ3A PriflU* 
jf).iKHU|ASHirjh R43*pl u ireni 

G 'tcr- Mc-ni | i' 
JC i.»3DHi *.1 High Hrirjlu I iCipi 

Cole WtPiCar vr'RGB Inpu: 
PC AMI A H<aB Cabld'Q- 

JC-t^HOHtAjCglor Man.lor 
Oiair LinguJijeLcJ'PinaRma^ . 
PC flffl 1 A Mltr&:amput»r Rin(i>rn/iz4S U 
PC »1JA IrO Urui UHr'iMartupi 
PC 303 1 A l>u n Dtjk UMt'i M>irK»i 



ZB5W 

1t95 0a 

1995 



1099 « 

599 00 

10«kj 



239 Of) 

t049 00 

)7.» 

11)95 
14 95 

14 H 



M (CROPROC ESSO RS 



ZWA. 
HI 13*801 
2<» .. 

C0 1W3 



SiaBOO 
1*900 
9M 
>3 95 
1Q9!i 
■L y, 
9 7S 
4.7S 
1995 
.... HBJ 
1J91 
9M 

14D.J 
JS « 
49 » 

J9 55 

iea& 
It 9& 

11r7S 

1995 
tTSS 
14_*5 
1993 
24 99 
4795 
5995 
37 *i 



ADVANCED SUPPORT 



3W>1 

noiA 

2903 * »! &jO*iti«:* 

rWS93«)J. 

CPlflOO 

5502 

Ufflt 

IMC 100 



HOOP tOiV 

UaOJP 
HOSEi 



IMBfiDTWI 
(?55 

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Ai.l'iV ■■ J, i -\\' PiKtH^jr 
3ilJ Aj.ih Pr«ai4MT 
9513 Unr, T.nid 
AM95 h T DWA Conlrolicr 



U300 
17.500 
7995 
11195 



*-80 SUPPORT CHIPS 



ZAO-010 



4 0MHI 
3 5MHJ 

IOMHI 
2.5 M*1i 

IOMHi 



ZBO-CTC 
ZtoA^CTC 
2M-QMA 
ZSOA'DMA 

zesA-sso i3Mh; 

L904KV1 i 5 MHi . 

.--:.-., :■ ■...,: 

Zao.<J<Ot2 40 MHz 



» 75 
I2M 

A 73 
1 2 95 
29*5 
»95 
3595 

atuta 

35*5 
3940 
35*5 

3940 

BO BO/80 flB f UP POUT 

24 93 
4*95 

3*95 
3 95 
2 79 
5 23 

2 7ft 
2 95 
9 76 
2« 



1 Ec-runi 



ei is &■ si If 
5^55 iC v 
MCI 0>n . . . 
ftZGj'743 -15 Ot ::-:*■■ 
92i 2 B esc |/o. 
62'* P'.-lv f 
92-14 Bu.Drw 
«iM C-sXk>3»f 

K2*!'4li4lHHfl 

SZ2B Bj*D---*- 
ST2fl B'.i [>!■,*.■ 
SZ2B3yJI CorVlrol 
5*733 S >* Cct 
UO l.'O E up 
S2W Al.n LWT. . 
5Z51 Pr« l,C 
1253 III Timir 
D1| ^-jg IrO 
B257 Ping DWA 
3259 ■= • : , 4nL 
H215 C "■ C ::■■:■-■: :■■ 
5279 P'&3 KtjMI'O 

flBOO SUPPORT C 

saioiji^aPj-^ 

MM 

BJ21 

5323 Pv Oii5> r,| 

S334-1 912i5 Ez-c- 

([MS'MWSSOJCfl^Com 

aw? Color cur 

B850 AOA 

CftftZ S*' 1 1 Aaitsar 



U7LA lSWhtiOSC 

0179 

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MCflS<L93 

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150 
550 
9 SO 
15.95 

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6 se- 
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i£95 
45 95 
1595 



4 73 

«50 
950 
10 75 

1595 
29 95 
2*95 
594 
994 
10*4 



flt»2 SUPPORT CHIP* 
3520 PIA 7 50 

6512 Mull . . Si 95 

B«30-»J.«3.»AM5 21.99 

5532 .-. 1995 

5551 1993 

BIPOLAR PROMS 

W»do 
Cuiiom Programming 

«2ttttUar5*Qa743,lfl3 423 

IJS^SiS^^TB.. . 12.» 
6181 JJifl 10745MB iH*!l-T6 4 25 
a2a.aH0ar74lwE&fri4OC i li 

KSl 2*552i'7 J l£2a7 &&*i. ITS . 4 25 

flafWrSBWT^sTOiiiiMcc a so 

BJl!31/T49471(513i*)T8 . .3.95 
l»137J741573 (1024x4|ra ..MM 
B2Sl41fl624J7*fe47i 51 3 liiTS 1 2 Bft 
a2aH47/T4S472c512jDST3 ... 12.95 
74W714JW9i3M»*Ti ., TM 

MOS PROMS 

2T54pBKi£|TS . . . 9993 

J'JEilK.SlTS. . -]fi95 

TM:S37i3.i4v,iiv 17JH 

2753,3V. laSONv 7 53 

2708 lasOHsl B.T5 

2705 |650Ni. 5» 

t702A 575 

Mj«.e-JAO U50 

MM5204Q 995 

CHARACTER OEN. 

2513-CCii 13/iUKwr 9 50 

25 1 3-004 |SV1 Lew4r . 10 95 

25l3-.ADUaL&V|Lo.nr. .. 1195 

MCMB3710 Aii|.5hlllBd 12 93 

uQvtiui Mnh Symio.. 13 45 

MCM33730 AtE4it Cdnfo-' :-3 45 

U ARTS/B AU D RATE 

THieOjrHiV l2Vi 3 95 

AV51 01345V. 1?V| 4 95 

m H^fi* It, 1 .' fi '-!.. 6 95 

•VilO-lsA'-liMnS^ 6 55 

IMMU2 7 9ft 

'". 1 : 1 B 93 

2350 ■jam 9 95 

■371BAUrD4 2494 

•ALKTNlirzfe «.9i 

MCm" 11.1ft 

4I0J 14 95 

MHi*l 9 93 

COM 5C15 1395 

INE5250 . . .. .1595 

KEYBOARD ENCODERS 
AV5-3374J '375 

Ays-iflOO 13 75 



STATIC RAMS 










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21L07 4*»'» fa}3>M- 
J1 11 V*ft9jj 

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4I&I411C iiK|i(,PiT. 

S.clo H f|.j:fls:MHi 

4ii5(Kri6-Pi-m 

40i44Ki i.tir.', 
4D«>4Ki i -11 P-. 

4JJ4 4K ■ ■.iig.hF.i 
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4«^4K* J|1flPtfilW04l4 
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5232 19i *"^ HtgolL 

*** RAMS !£5 

519-35 tocj 



3^T 
24 95 
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LED READOUTS 



1H HM f«rW OflHI H 



ncWflilHi m PW iflm Am* 

PH»H »D HM ;m *.-=*." 

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ni«H 1» Olftjr Cflwi CjHa 

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ruMOTam ua «tn EtvJrd 

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w<kh xa rH e*™» baaai h«h tf 

MA*»t )l» E*PP £*m toJ**fiD' 

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MXKQ4 JK» frtm i»™ drift *-?h t* 

IAHK41 M4 iRw Iwi Mi» K-J! CP 

UUOU H9 'nnw t*r- t»l im Es* 

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IC SPECIAL PURCHASE 



D H 



S2&MS4K9Rn/n 

r#auc«tijpttm 

DA^HEXDMCofH 

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FOR INTERNATIONAL ORDERS. 
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CIRCLE 6 ON FREE INFORMATION CARD 



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3.95 
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ISO 
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RETAIL STORES OPEN MON-SAT 



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AEMVNCED 

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Quick and easy bread boarding 
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I Re-use as many times as you want 
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Shown with QTS9S and 2-QT59B 
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6101 "Experimenting with Digital Circuits" 

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QT47B 
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QT59B 

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$ 2,59 
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2.99 
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21654 GuldB to CMOS Basics $3.95 

CMOS devices, their characteristics and design rules. 
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VIDEO 

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ramsaij the first name in Counters ! 



9 DIGITS 600 MHz $129| IRED 




SPECIFICATIONS 



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The CT-90 is the most versatile, feature picked counter available for less 
than £300,00! Advanced design features include; three selectable gate times, 
nine digit*, gate indicator and a unique display hold function which holds the 
displ ayed count after the input si gnal is removed Also, a 1 mHz TC XO time 
base is used which enables e asy »n> beat cali brati on checks agai ns c WW V. 
Optionally: an internal mead battery pack, external time base input and M icro- 
power high stability crystal oven time base are available. The CT-90, 
performance you can count on] 



Range: 

Sensitivity 

Resolution: 



Display: 
Time base: 



Power 



20 Hi to 600 MHz 

Less than 10 MV to 150 MHz 

Less than 50 MV to 500 MHz 

0,1 Hz (10 MHz range) 

1.0 Hz (60 MHz range* 

10,0 Hif-SOOMHi range) 

9digita0.4 JJ LED 

Standard- 10.000 mHz, 1.0 ppm 20-40'C 

Optional Micro- power oven-Ol ppra 20-40 a C 

8-15 VAC® 250 ma 



7 DIGITS 525 MHz $99f IRED 

The CT-70 breaks the price barrier on lab quality frequency counters. 
Deluxe features such ax three frequency ranges - each with pro amplification, 
dual selectable gate tunes, and gate activity indication make measurements a 
Snap. The wide frequency range enables you to accurately measure signals 
from audio thru UHF with 1 ,0 ppm accuracy- thaf* .0001%! The CT-70 is 
the answer to all your measurement needs, in the field, lab or ham shack. 




SPECIF1C«K 


Range 


20 Hi to 525 MHz 


Sensitivity; 


Less than 50 MV to 150 MHz 




Less than 1 50 MV to 500 MHt 


Resolution: 


1.0 Hi (5 MHz rinse) 




10.0 Hi (50 MHz range) 




100.0 Hi (JOO MHi range) 


Display: 


7 digits 0.4" LED 


Time base: 


1,0 ppm TCXO 20-40'C 


Power 


12 VAC ® 250 ma 



PRICES; 

CT-70 wired, 1 year warranty J99.95 
CT-70 Kit, 90 day parts war- 
ranty 84,95 
AC-1 AC adapter 3.95 
DPI Nicad pack + AC 
adapter/ charger 12.95 




7 DIGITS 500 MHz $7955 

WIRED 



PRICES: 

MINI- 1 00 wired, I year 

warranty 579^.95 

AC- Z Ac adapter for M1N I- 

100 J.95 

BP-Z Nicad pack and AC 

adapter/ charger 12,95 



Here's a handy, general purpose counter that provide* most counter 
functions at an unbelievable price. The MINMOO doesn't have the full 
frequency range or input impedance qualities Found in higher price units, but 
for basic RF signal measurements* it can't be beat! Accurate measurements 
can be made from l Mil; all the way up to 5 00 MHz with excellent sens itivity 
throughout the range, and the two gate limes Let you select the resolution 
desired. Add the nicad pack option and the MINI- 1 00 makes an ideal addition 
to your tool box for J in-the-f>elo" frequency checks and repairs. 



SPECIFICATIONS: 



Range 
Sensitivity: 

Resolution: 

Display: 
Time base: 
Power 



1 MHz to 500 MHz 
Less than 25 MV 
100 Hz (stow gate) 
1.0 KHz (fast gate) 
7 digits, 0,4" LED 
2.0 ppm 2O-40 s C 
5 VDC ft 200 ma 



8 DIGITS 600 MHz $159^* 

WlKJiD 



Range: 
Sensitivity: 




SPECIFICATIONS: 




Resolution: 



20 Hz to 600 MHz The CT-50 is a versatile lab bench counter that will measure uptofiOO MHi 

Less than 25 mv to J 50 MHz •*£)) g digji precision And, one of its best features is the Receive Frequency 

Lea than 1 50 mv to 600 MHz Adipter, which turns the CT-50 into a digital readout for any receiver. The 

1.0 Ha (60 MHz range) . _"■ ! ., . . . . . , 

100 HzfoOO MHz ran net adapter is easily programmed for any receiver and a simple connection to the 

8 dieits 4" LED receiver's VFO is all that is required for use, Adding the receiver adapter in no 

2,0 ppm2fM0*C w * v t™&* *h* operation of the CT-50, the adapter can be conveniently 

110 VAC or 12 VDC switched on or off The CT-50, a counter that can work double- duty! 



PRICES: 




CT-50 wired, 1 year warranty 


$159.95 


CT-50 Kit, 90 day parts 




warranty 


1 19,95 


RA-1, receiver adapter kit 


14,95 


RA-I wired and pre- program- 




med (send copy of receiver 




schematic) 


29.95 



DIGITAL MULTIMETER $99^ IRED 




PRICES 




DM-700 wired, 1 year warranty 


S99.95 


DM-700 Kit, 90 bay parts 




warranty 


79.95 


AC-1, AC adaptor 


3.95 


BP-3. Nicad pack +AC 




adapter/ charger 


19.95 


MP-1, Probe kit 


2.95 



The DM"700 offer* professional quality performance at a hobbyist price. 
Features include; 26 different ranges and 5 functions, all Arranged in a 
convenient, easy to use format. Measurements are displayed on a large l : *:■ 
digit* VS inch LED readout with automatic- decimal placement, automatic 
polarity f overrange indication and overload protection up to 1 Z 50 volts on all 
ranges, making u virtual! v goof proof TheDM'700 looks great, a handsome, 
jet black, rugged ABS case with convenient retractable tilt bail makes it an 
ideal addition to any shop- 



SPECIFICATIONS: 
DDACvohx lOOuVtol 
DO AC 



KV, 5 ranges 



current 

Resistance 

Input 

impedance: 

Accuracy. 

Power 



0. 1 uA to 2.0 Amps, 5 ranges 

0. 1 ohms to 20 Megohms, 6 ranges 

10 Megohms, DO AC volts 
0.1% bask DC volts 
4 'C cells 



AUDIO SCALER 

For high resolution audio measurements, multiplies 
UP in frequency. 

• Great for PL tones 

• Multiplies by 10 or 100 

• 0.01 Hi resolution; 

S29.9J Kit S39.95 Wired 



ACCESSORIES 

Telescopic whip antenna - BNC plug ...... S 7,95 

High impedance probe, light loading ..»*,,.., 15,95 

Low pass probe, for audio measurements , 15.95 

Direct probe, general purpose usage , , . , T .-..»**.„. 1 2-95 

Tilt bail, for CT 70, 90, MWI-100 3.95 

Color burst calibration unit, calibrates counter 

against color TV signal — 14.95 



COUNTER PREAMP 

For measuring extremely weak signals from 10 to 1.000 
MH:. Small sbe f powered by plug transformer-included. 

• Flat 25 dbgain 

• BNC Connectors 

• Great for snilTing RF with pick-up loop 

534.95 Kit S44.95 Wired 



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RS232 and "D" SUB-MINIATURE 
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PART NO. 

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HESCR1PTI0H 

9 pin male 
9 pin lertwle 
9 pin caver 
ISpJnmak 

IS pin female 
15 pin carer 

25 pin mole 
25 pin lemale 

1 pc. grey hovd 

2 pc. grey hood 
2 pc block hood 

37 pin mole 

37 pin female 

37 pbn caver 

50 pin male 

50 pin Eemcle 

SO pin caver 

[far aware id 2 pr. 

AS232, DB2SP. EIA 

Class I cable Scan. 8 II. 

Cent 700 Series 

Printer connect or 



1-9 

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i 1.70 

S ISO 

S 2.75 

S 3.95 

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PRICE 
10-24 
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510.25 

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25-99 

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5 .70 



519.95 S1795 51595 
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2I14N3L 

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INS 8080A 


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1N5 8085A 


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DP9212N 


92. 95 


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55.25 


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$9.95 


DP8226N 


S3. 50 


DP822BN 


S5.SS 


DP323BK 


$5,55 


INSS250N 


$15.00 


INSU2MN 


S7.50 


INS8253N 


$17.95 


1NS925SH 


$3.80 


INS8257N 


$16.45 


1NK8259N 


$18.00 


INSB27SN 


$59.95 


INS8279N 


$49.95 


Z80 SERIES 


Z80A 


$14.95 


Z8OAP10 


$14.95 


Z80ACTC 


$13.95 


Z80ADMA 


$45.00 


zsoAsroo 


$55.95 


zeoAsibi 


$59.95 


Z80A3102 


$59.95 



65.02 

G502A 

S520 

G522 

9530.002 

SMTHXB 

8530.004 

3530-005 

B532M 

S551M 



$12.35 
$19.95 
58.95 
$10.95 
$21.95 
$21.85 
$21.95 
$21.95 
$21.95 
$21.95 



6800 SERIES 

PART NO. PRICE 



FLOPPY DISC 
CONTROLLER 



MCE300P 

MC6802P 

MCB80SP 

MCB309P 

MC6S2IP 

MC6829P 

MC6840P 

MC3845P 

MC6847P 

MC6930P 

MC6352P 

MCS854P 

MCSS&DP 

MC6SK2P 

MC687SL 

HC66710P 

MC66750P 

UAHTS 
PART NO 
AY5I013A 
TRI602B 
TR1863 
IM6402 



SI 1.95 

$17.95 

$3.95 

S34.95 

$5.95 
$14.95 
S11.9S 
S31.00 
S14.3S 

85.41 

$5.79 
$24.35 
$10.89 
S12.00 

S7.40 
$12.50 
$12.50 

PRICE 
S5.95 
$5.95 
S8.35 
S7.S5 



FD1771B-01 
FD1731B-01 



$24.95 
£44.95 



from 



I0MHZ16KA&T 
STATICS- 100 RAM 

List $349.00 $169.00 EQ 

.00 




• Operates up to 10 MHZ (90 ns RAM Chips] 
■ Assembled 8t Tested* Meets or exceeds 
all IEEE 696/S-100 specifications (including 
timing). * Fully static design eliminates the 
timing problems associated with dynamic 
memories. ■ Switch selectable choice of 24 
address lines conforming to the IEEE 
696 /S- 1 00 extended addressing 
specifications, or 16 address lines as used 
in older S- 100 systems. ■ Ideal for mult i -user 
installations. * Board is addressable as one 
16K x 8 block on any 4K boundary. • Switch 
selectable PHANTOM disable and write 
protect. ■ + 5 Volt operation (requires no 
other supply voltages). ■ Low power 
operation (900 mA typical, 1200 mA 
maximum). - 1 year Factory Warranty. 




5-100 "ANT DIP" has lull power and 
ground planes back lo back. Boards 
accommodates .3, .4. .6. .3" Dips. 

1-4 5-3 10-24 

$24. 67 $22.34 $20.02 

APPLE PLUGBOARD 
Vector 4608 Peripheral Interlace 
Plugboard lor construction of custom 
circuits. Plug compatible with Apple 
H r Commodore PET and Super Kim 
microcomputers. VCT-46G9 

1-4 5-9 10-24 

$20.74 S18.79 $16.84 



Universal Microcomputer/ 

processor plugboard use with 
S-100 bill. Complete wilh heat 
sink k hardware 53" s ID" I 
1/16". 

1-4 5.9 1G24 

$22.48 529.37 513.16 

VCT-8S01-1 
Same dj S803V except plain. Less 
power buses & heat sink. 

1-4 5-9 10-14 

115.67 $14.24 512.8! 



VCT-3E8Z 9.6' « 4.5" 

■ $1161 
VCT-a!S2-2S.5"!t4.S' 
511.04 
Hi- Density Dual-In. Line Plug 
board lor Wire Wrap with Power 
& Grd Bus Epoiy Glass 1/16" 
44 pin con. spared .158 



VCT-3B6T 98" 
51135 
VCT-3677-26.S"*4 5" 
510.89 

Gen Purpose D LP. Boards with 



VCT-3EHE.5"x4.5" 

51.69 

VCT-3B6J-2 3.6' *4.5 

$11.85 



Bus Pattern lor Solder or Wife P pctlem plugboards lor IC s Ex- 
Wrap. Epoxy Glass 1/16" 44 pin poxy Glass 1/18" 44 pin con. 
con . spaced . 1 56 spaced 156 



VCT-3SM-I1 $16.64 

CARD EXTENDER 

Card Extender bos 100 conlacl* 
50 per side on .125 centers. 
Attached connector-is compati- 
ble wilh S-100 Bus Systems. 
VCT-3690 6.5" 22/44 fill 
156 el rs. Extenders ...SI5.6G 




fe.sjte* 5 ! 



BOARD 

.042 diaholes on 
0.1 spacing for IC's 



Phenolic PRICE 

PART NO. SIZE 1-9 10-19 

VCT-S4P44-X 4.5"x6.5" $1.56 11.411 

VCT-1S9P44.X 47" x 17" $3.69 13.32 

Epoxy Glass 

VCT-E4P44 4.5" 1 6.5" $1.13 51.65 

VCT-MP44 4.5" 1 8.5" $2.25 $2.03 

VCT-1SSPM 4.5" 1 17" S4.E1 $4 15 

VCT-169P4J 6.5" 1 17" $9.10 18.10 



ZERO INSERTION 
FORCE TEST SOCKETS 



TRS-80/APPLE 

MEMORY EXPANSION KITS 
4116'sRAMS 

from Leading Manufacturers 

(16Kxl 200ns) 

8 for $20. 00 

Add $3.00 for programming Jumpers 
for TRS-80 Keybaord 



POWERLINE 
INSOLATOR 



.1 Price $59" 
Sole Price 
S2B.HO 

A MUST FOR 
EVERY OFFICE 
WITH DATA 
PROCESSING 
EQUIPMENT 




d 



ZIP-16DIP 

ZIP-24D1P 
ZIP-UHDIP 



'■~-^~~-' : 'J- 




10-24 25-99 \ 1 



5 5J0 $5.15 $4.95 

5 7.50 S7.2S 56.95 

51015 $9.15 $5.58 



SEND$1 00 

for 60 Page 

CATALOG 



6 OUTLET 

MULT1USE 

CORD REEL 

SH.WT 5 LBS 
' GOF-Cftl 22 It Cord S2495 
GOr-CRSOSOil Cord 343.95 



SPECIAL PURCHASE 

GOLD 

16 PIN LOW 

PROFILE IC. 

C-95 SOCKETS 




esuSsshJ TfTfrf T : r 

TIG-16LP p k 9 . oi 100 $16.0C 
TIG-16LP P kg. oi 1000 $120.00 

OEMS Stocli up at Usl« LOW PRICE 



IM-IOAUot 5104.95 
SPECIAL 

569.95 wilh lube 
Perfectly balanced Huores- 
cent lighting with precision 
magnifier lens. Tough 

thermoplastic shade. Easy 
lens removal. New wire clip 
design permits easy instal- 
lation and removal of 
flourescent tube. Comes 




LEOU 



with plastic shield to pro 
ted tube from soiling and 
damage. 
Colors" Gray, Black* and 
Chocolate Brown. Conn 
with one 22 watt T-5 Circling 
fluorescent tube, 3 diopter 
lens. 10 lbs. 




PRIORITY I ONE { ELECTRONICS psg" 

W* 9 16 1 -R DEERING AVE. • CHATSWORTH, CA 91311 OJ 

ORDER TOLL FREE (800) 423-5922 CA, AK, HI CALL (213) 709-5464™' 

Terms: US. VISA. MC, BAC Check Money Oidet. U.S. Funds Only CA residents add 6% Sales Tax MINIMUM PREPAID ORDER S15CO. 
Include MINIMUM SHIPPING & HANDLING of S2.SO loi the llrsl 3 lbs. plus 25c lot each additional pound. Orders over 50 lbs. sent 
treighl. colled. Jus! In case- please Include your phone no. Prices sub)ecl lo change without notice. We will do our best to main- 
lain prices Ihru Ociotaer 1981 SOCKET and CONNECTOR prices based on GOLD, not exceeding S7DQQO per oi 

Sales Prices Valid only ii TOO mention publication and month Credit Card orders will be charged appropriate treighl 



118 



CIRCLE 45 ON FREE INFORMATION CARD 



BUY WITH 

CONFIDENCE FROM 

THE NATIONS LARGEST 

#!SJJ&!SM! DISTRIBUTOH 



Single and dual trace. lSlhru 100 MHz, All high sensitivity 
Hitachi oscilloscopes are built to demanding Hitachi 
quality standards and axe backed by a 2 -year warranty. 
They're able lo measure signals as low as lmY 'division 
(with XS vertical magnifier). It's a specification you won't 
find an any other 15 or 30 MHz scopes. Plus: Z-axis 
modulation, trace rotation, front panel X-Y operation for 
all scope models, and X10 sweep magnification. And, 30 
thru 100 MHz oscilloscopes offer internal signal delay 
lines. For ease of operation, functionally related controls 
axe grouped into three blocks on the color coded front 
panel Now here's the clincher: For what you'd expect to 
pay more, you actually pay less. Check our scopes before 
you decide. All scopes complete with probes. 



HITV302B 



List $995.00 
SALE $819.00| 

TV sync-separator circuit 

High -sensitivity lmY/div 

(SMHz) 

Sweep'time magnifier 

(10 times] 

Z-axii input (intensity 

modulation) 

Signal delay line 

Complete with 2 probes 

30MHZ '^ C v H2 ri DU 1 AL - ADD - 

DUT, Vertical 
DUAL TRACE Deflection Modes 

OSCILLOSCOPE • Trace Rotation 

Hitachi . . . The measure of quality. 
HITV152B DUAL TRACE 15MHZ t»<W=y) 

list $735.00 SALE $629.00 




IFLUKEI MODEL 

~^ ® D304: 

* Nine functions; 1 -pj/ fl W T ^Hl 

kZ$z AC oALL 
tt^z DMM'Q 

5. resistance ^L^r X'U*X l^# 

6. diode test 

7. conductance ( 1 -R'l 

8. logic level and 
continuity detect 

9. temperature (K-type 

thermocouple) 
ID. Peak hold on voltage and 
current lunations 

11. Selectable audible 
indicator for continuity or 
level detection 

12. 3H -digit resolution 

13. 0. 1% basic, accuracy 
M, LCD display 
35. Overload protection 
LB. Safety designed tesl leads 

FLU-D80Q (Funct, i* . . "JUS. 00 

FLU-D802<r un c t . 1 .7» $189.°° 

FLU-D804 <*«*,. i* $249.oo 

FLU-D810mMSBenchl A, $269.°° 

FLU-D81 1 (RMS Bench wfflatt.) .. $309. 0° 

BUY ANY OF THE ABOVE 

FLUKE DMM AND PURCHASE 

THE CASE FOR 10 WHEN 

YOU MENTION THIS MAGAZINE AD 

FLU C90 (Case for 0000, 802. B04 ...$10.°0 

FLUY-8205(c a »toD.io.wi> ...$35.°° 





HIT-V2G2 HIT-V352 

20MHi DUAL TRACE 35MHz DUAL TRACE 

with delay 
list price; 5ssg list price: si 150. 00 

saleprice $775.00 saleprice$950 i od 



' Dynamic range 8 div. 

■ TV sync separator 
circuit 

■ Built-in signal delay 
Une{V^52) 

1 XToperatlori 

■ Sweep-time magnifier 
(10 times) 

1 Trace rotation system 

■ Fine adjusting, 
click, positioning 
function 



Economically priced 
dual trace oscilloscope 

■ Square CRT with 
internal graticule 
(illuminated scale) 

■ High 'accuracy voltage 
axis fit lime axis set at 
±:3% (certified at 11? 
to3!PC) 

' High-sensitivity 
ImWdiv. 

* Low drift 

* 2 Year Warranty 



50 MHz & 100 MHz 

DUAL TRACE WITH 

CALIBRATED TIME DELAY 



HTTV55QB 

50MHz with 

3rd TRACE 

TRIGGER VIEW 

LIST $1745.00 

SALE 

CALL 



HITV1050 

lOOMHss with 

3rd & 4th TRACE 

TRIGGER VIEW 

LIST $2390.00 

SALE 

CALL 



The HITACHI V55QB (SOmHi) and V1050 (lOOmHi) offer 
all the capabilities you might expect from a lab grade 
oscilloscope. Capabilities such as 3rd trace trigger 
view, a bright 0" square CRT and a mar. swoop rate of 

2nB./div (V1050) Sns/div (V5MB!. Also, features you may 
not expect like, sensitivity of lmv/dlv (V550B) .Sm/div 
{V105Q) fS> lOraHs, autamatic focus correction. 



Sectoring 
Soft :,. cloi 



VRB-MDSlS-ia Kid IG Smlot 

YHI-MD52S-16 Hum 16 Soclor 

MU-HH557-D1 Soft Sector 

YHS-MDS57-I0 Hard 10 Sectar 

YHB-KDS57-1S Hon) IG S«li>r 

YHB-S41557-B1 Soil Seclsr 

VRB-MDS57-11I Horn 1 10 Sector 



VHB-MD5TJ-1S Hcmi IE Seclw 



1 



1 



Applicntiati 
TRS-80 Apple 
40 Trotk Cerl 
North 51 nr 
40 Track Ctrl 
Micnrpollt 
40 Track Ceil 
77 Track bit 

loom 

77 Tiatk Cerl 
100 TPI 
77 Track Ctrl 
100TPI 
77 Track C«rt 
ISO TPI 
77 Track Cerl 
100 TPI 
77 Track Cerl 
100 TPI I 

VABMD Series comet with reinlorced bus ring meuatrd 

8" DISKETTES 

KR3-FD32 Hard Sector Shugnrl SOI R 1 537.00 

YHB-FD34 Soil Sector IBM 3740 1 J37.M 

TRB-FD3i-2 Hard Sector Flippy 1 556.08 

YHB-FD34-2 Soil Sector Flippy 1 S6E.W 

Y.rhcrllm 8" Dliktltu burg oil Ikt Dotilili 

ImprevtmtDli witboul the hnriholt reinforce meat rings 

ALL YERBATInt DISKETTES 

ARE DOUBLE DENSITY CERTIFIED 



I 



1 



(31.00 



131.00 
137.00 



S56 00 



SSS.00 



::sao 



HB.ttO 



S43.no 




xoatMsa* 



ICN SERIES 

GOLD 3 LEVEL 

WIRE WRAP 

SOCKETS 

• 10 Inch GOLD Plated Pins 

• Deep Chamfered Oosewd Entry 
Contacts 

• RN Side Wipe Contact Destan 

• Phosphor Bronze Cwilacl Material 
« Terminal Barbs Allow Sell-lock into 

PC Board 

• Rugged Sockel Body Design 

• Deep Chamfered Closed Entry 
Contacts 

PRICE 



PINS 1-9 10-24 25-99 100-249 250-999 



HNSQ8WWG 9 
RNS14WW9 14 
RNS16WWG 15 



RNSISWWG 
9NS20WW9 
BNS22WWG 
RHS24WWG 

ntti2twwe 



IB 
20 
22 

24 
29 



.90 
,79 
.99 

1.00 
12D 



.95 
.TO 
,75 

.30 
IDS 



1.35 S.25 

1.35 1.25 

1,70 1.5S 

2.29 2.05 



HHS40WWG 40 
GOLD PLATED CONTACTS 



.40 
.95 
.70 
.90 
96 
1.15 
1.15 
1.40 
1.85 



.49 

.55 
.90 
.79 
.91 

1.05 

1.05 
1.34 
1.99 



.41 

50 
55 
.71 
.97 
.99 
.90 
1.25 
1.50 



=- TIN 

Iplateo 

TAILS 



NEW! 

SELECTIVE PLATED 
PINS THAT WILL SAVE 
YOU MONEY" BY 
HAVING GOLD ONLY 
WHERE IT COUNTS! 
Seme aa shove except 
pins ere selectively 
plated. 



PART NO. 

RHSDBTWW 

RNSI4TWW 14 

RNS19TWW 16 

RNSiarWW 13 

9NS20TWW 20 

1NS22TWW 22 

RHS24TWW 24 

RNS28TWW 20 

RHS4DTWW 40 



PRICE 
PINS 1-9 1D-24 25-99 190-249 250-999 



.55 
.95 
.7J 
.90 
1.10 
1.29 
1.25 
1.50 



50 

.55 
.65 
.79 
95 
1.15 
1.15 
1.45 
1.99 



.45 
.53 
.58 
.75 
.91 
1.05 
1.05 
1.35 
1.60 



.41 
47 
.51 

.70 
.97 
.94 
.90 
1.15 
1.49 



.37 
.45 
.49 
.05 
.52 
.99 



1.30 



CCS2422A LIST £425,0OchT P 

FLOPPY DISK CONTROLLER „?1TT7! 

WITH CP/M VERSION 2.2 $300. 00 

IEEE S-100 COMPATIBLE SINGLE/DOUBLE DENSITY 
5W"/B" DISK DH1VES 
Wl™r_-, Sm , SINGLE/DOUBLE HEADED 
™ , "" r s ™ nB ASSEM BLE D & TESTED 

CCS2810 Z80 CPU 
2/4 MHZ CPU W/Serial I/O 

List Price SALE PRICE 
CCS2810 A&T $310.00 $275.011 



^.Shugart 

SA801R 
SALE 





ONE 



SHU-SA801R ^"$425.00 

2 OR C"^0*\ 

MORE VW/W. 

J ELECTRONICS 



ea. 



PRIORITY I 

9161 DEERLNG AVE. • CHATSWORTR CA 91311 
ORDER TOLL FR1E CSOO) 423-5922 CA, AK^ HI CALL (213} 70*5464 

Terms uSj VISA. MC BAG. Check Money Oidet. US Rinds Onlv. CA residents add 6% Sales Tax 
MINIMUM PREPAID ORDER S15.CO. fnclude MINIMUM SWPPING k HANDLING oi S260 (01 the tlBl 
3 LDs. plus 25c for each additional pound. Orders over 50 lis sen! frefaht collect . Just in case. 
J^jg^ please include youi phone no. Prices suotecl lo chanoe without notice. We will do our bea Id 
■rnrfJJ mainlain prices thru October. 1981 SOCKET and CONNECTOR prices based on GOLD, not 
■ll^J exceeding 5700.00 per oi Sales Prices Valid only If TOO mention publication and month. 
1^^^ Credit Card orders will be charned appropriate fieiohl 



Z 
O 
< 
m 

oo 
m 

3J 



CIRCLE 45 ON FREE INFORMATION CARD 



119 



TOLL FREE ORDERING NUMBER 1(800) 423-7144 



PRODUCTS 




JUST WRAP KIT 

Just Wrap too! for 
daisy chain wiring. 
Tool strips as it 
wraps and cuts. 
Includes one 50 foot 
spool of wire. 



Pan No. Description Pries 

JW-1' Just Wrap Tool SI 4.95 
JWK-6 Tool w(4 Spools and 

JUW1 24.95 
R-JW* 50 Ft. Replacement 

Wire 3.49 

JUW-1 Unwrapping Tool 3.49 

•Specify Color: Red, Blue, White or 
Yellow. 




Regular Modified 

Wrap Wrap 

HAND WRAP TOOL 

Description Price 

Regular $6.95 

Modified 7.95 



-IZfcSI^^Ul) 



TERMINALS 

• .025 

(0,63mm) 
Square Post 

^-erm-f^t^^ -. • 3 Level 

^SKpIp^cCU Wire- 

Wrapping 

_pS3SS3> • Gold Plated 

25 PER PKG. 
mrtJ 

Part No. Do script ion Price 



WWT-1 
WWT-2 

WWT-3 
WWT-4 

INS1 



Slotted Terminal 

Single Sided 

Terminal 

IC Socket Term. 

Double Sided 

Terminal 

Insertion Tool for 

above 



$4.93 

2.98 
4.98 

1.98 

2.49 



SOCKET WRAP - ID 

socket before 
Uraf-ID wrapping to 

rv.»»4 identify pina. 

n n u » a 7 t i t s i i 

• •••••••••• * 

Bulk Bulk 

Part * Price Pries Part # Price Price 

14ID 1.43/10 5.50/100 221D 1.49(5 5.95/50 

161 D 1.49/10 5.95/100 24! D 1.49(5 5.95/SO 

1810 1.49/10 5.00/50 28! 1.49/5 6.50/50 

20 ID 1.49/5 5.00/50 40ID 1.49/5 5.00(25 



■ p.c.b. 
terminal 

STRIPS 

The TS strips provide 
positive screw activated 
clamping action, accom- 
modate wire sizes 14-30 AWG (1,8-0, 
25mm). Pins are solder plated copper, 
.042 Inch (1mm) diameter, on .200 inch 
(5mm) centers. 

Description Pries 

4- Pol a $1.69 

8- Pole 2.59 

12-Pole 3.49 

2-Pole Interlocking 3/1.79 



Part No. 

TS- 4 
TS- 8 
TS-12 
TS6MD 




DESOLDERING 

PUMP 

Easy one hand 
operation. 
Rugged all metal 
construction. 
Replaceable 
TEFLON 8 Tip. Self 
cleaning on each stroke. 
Suction precisely regulated for reliable 
desoldering without damage to delicate 
circuitry. 

DSPI Desoldering Pump $9.95 



LOGIC PROBE 




0%i 




Compatible with all logic families us- 
ing a 4 to 15V power supply. 
Thresholds automatically programm- 
ed. Visual indication of logic levels to 
show high, low, bad level or open cir- 
cuit logic pulses. 

•10 N sec. pulse responses 
• 120 K Input impedence. 
•Automatic resetting memory, 
•Includes tip with protective cap S. 
coiled cord. 

PRB-1 $36.95 

LOGIC PULSER 

Superimposes a pulse train (20 pps) or 
a single pulse onto the circuit node 
under test without un-soldering IC's. 

• Automatic polarity sensing 

• 2 us pulse width 

• Finger tip push button actuated 

• Includes tip with protective cap & 
coiled cord. 

PSL-1 $48.95 



VACUUM VISE 

Unique vacuum-based 
light duty vise for 
precision handling of 
small components and 
assemblies. Rugged 
ABS construction. \W (32mm) 1 
travel for maximum versatility. Also 
features screw lugs for permanent 
Installation. 




VV1 



Vacuum Vice 



$3.49 



HOBBY- 
WRAP 
TOOL 
BW263 




Auto-Indexing 
Anti-Overwrap 
Modified Wrap 



Part No. 

BW2630 
.BT30 
BT2628 
BC1 



Description 

Tool 

#30 Bit (not incl.) 
#28 Bit (not incl.) 
Batteries & Charger 



Price 

$19.85 

3.95 

7.95 

14.95 



INSERTION/EXTRACTION 
TOOLS 



Part No. 

INS1416 

MOS1416 

MOS2428 

MOS40 

EX1 

EX2 



Description 

14-16 pin Inserter 

14-16 pin MOS Safe 

Inserter 

24-28 pin MOS Safe 

Inserter 

40 pin MOS Safe 

Inserter 

14-16 pin 

IC Extractor 

24-40 pin 

IC Extractor 



Price 
$3.49 

7.95 

7.95 

7.95 

1.49 

7.95 




WK-7 IC 
INSERTION K 

B Complete IC In- 
serter/ Extractor K 
Individual Com- 
ponents (listed 
above) $22.95 



IC DISPENSER 



Ailows IC's to be dis- 
pensed from their tube 1 
at a time and picked up 
by insertion tools above. 

• Dispenses 8-42 pin 

IC's * Compatable with 

all IC carrying tubes < 

Use with WK7 for MOS 

safe insertion. 
Pan No. Description Price 

MDD1 1 Chan. Dispenser $21.85 

MD05 5 Chan. Dispenser 83.43 

MDD10 10 Chan. Dispenser 160.45 
"No Discount. 




i* 1 



CIRCLE 40 OK FREE INFORMATION CARD 



page 1858 EVERGREEN • DUARTE. CALIFORNIA 91010 • TELEPHONE (213) 357-5005 



TOLL FREE ORDERING NUMBER 1(800) 423-7144 



IDC CONNECTORS 



RIGHT ANGLE HEADERS 

SOLDER T A) L W1REWRAP 

Part No. Price 
IDH10SRB J1.20 
IDH20SRB 1.90 
2.7S 
3.75 
3.7S 
4.75 

,1" Spacing. Mounts on PC Board & Mates 
with IDS Socket below. Ejector Bars- 4/1.00 



Size 

10 

20 

26 

34 

40 

50 



IDH26SR8 
IDH34SRB 
IDH40SRB 
IDH50SRB 



Part No. 
IDH10WRB 
IDH20WRB 
IDH26WRB 
IDH34WRB 
IDH40WRB 
IDH50WRB 



Price 
$2.60 
4.15 
5.35 
6,25 
7.35 
9.20 




25 PIN "D" CONNECTORS 



Solder Style 


Part No. 


Price 


Male 


DB25P 


$2.95 


Female 


DB25S 


3.95 


Cover 


DB25C 


1.50 



IDC Style 

Male IDB25P 6.25 

Female IDB25S 6.60 

Cover IDB25C 1.60 

Solder Style solders onto cable, IDC 
Style crimps onto cable with vise. 9, 
15, 37 and 50 pin available also. 



WIRE WRAP WIRE 






#30 Wire Wrap Wire 




Length 100,'Bag 


500/Bag 


IK/Bao, 


2.5" 


$1.38 


S3.94 


$6.81 


3.0" 


1.43 


4.25 


7.46 


3.5" 


1.51 


4.57 


8.11 


4.0" 


1.56 


4.88 


8.73 


4.5" 


1.63 


5.21 


9.39 


5.0" 


1.69 


5.54 


10.04 


5.5" 


1.74 


5.92 


10.69 


6.0" 


1.82 


6.23 


11.34 


6.5" 


2.11 


7.08 


12.99 


7.0" 


2.19 


7.44 


13.68 


7.5" 


2.29 


7.76 


14.40 


8.0" 


2.35 


8.12 


15.10 


8.5" 


2.40 


8.46 


15.80 


9.0" 


2.46 


8.92 


16.51 


9.5" 


2.63 


9.15 


1T.22 


10.0" 


2.63 


9.58 


17.91 


All le 


igths are overall, 


including 


1" strip 


on each end. Choose t 


ram colors; Red, 


Blue, 


Black, Yellow, White, Green, 


Orange, and Violet. 








EDGE CARD CONNECTORS 

Size Part No. Price 



10 


IDE10B 


$3.95 


20 


IDE208 


4.35 


26 


IDE26B 


5.00 


34 


IDE34B 


6.05 


40 


IDE40B 


6,90 


50 


IDE50B 


7,50 



.1" Spacing. Crimps onto cable with 
ordinary vise & mates with standard 
.062" Card Edge. 




CABLE PLUGS 

Size Part No. 



14 
16 
24 
40 



IDP14B 
IDP16B 

IDP24B 
1DP40B 



Price 

$1.45 
1.65 
2.50 
4.15 



.1" Spacing. Crimps onto cable with 
ordinary vise & plugs into standard IC 
Socket. 



WIRE WRAP SUPPLIES 



4||^ 



11 " 



Size Part No. 



Each 



Tube 



OS 


ICNQ83WBSG 


.44 


52): .39 = 


= S20.28 


14 


ICN143WBSG 


.53 


30x .46 = 


= $13.60 


16 


ICN163WBSG 


.58 


26k .50 = 


= $13.00 


18 


ICN1B3WBSG 


.78 


23x .68 = 


= $15.64 


20 


1CN2Q3WBSG 


loo 


21 x .85 = 


= SI 7.85 


22 


ICN224WBSG 


1.07 


19k .92 = 


= $17.48 


24 


ICN246WBSG 


1.09 


17K1.09: 


= $15.98 


2B 


ICN2B6WBSG 


1.43 


15x1.23 = 


= $18.45 


40 


ICN406WBSG 


1.85 


10x1.60 = 


= $16.00 



Selective Plating provides gold in contact 
where It counts. 3-fevel wrap. Save by buy- 
ing sockets by trie tube. All gold available at 
Vit/pin extra charge. 

* " "No Discount 



RIBBON CABLE 








Solid Color 


Color Coded ^S 


Size 


10 tl. 


100 tl. 


10 ft. 


100 It. V 


10 


2.90 


17.00 


4.00 


30.00 


14 


3.40 


23.80 


5.00 


42.00 


16 


3.70 


27.20 


5.60 


48.00 


20 


4.40 


34.00 


7.00 


60.00 


24 


5.00 


40.80 


8.00 


72.00 


26 


5.40 


44.20 


8.60 


78.00 


34 


6.80 


57.80 


11.00 


102.00 


40 


7.80 


68.00 


13.00 


120.00 


50 


9.50 


85.00 


18.00 


150.00 



SOCKETS 


> 


Size Part No. 


Price 


10 IDS10B 


$1,88 


20 IDS20B 


2.75 


26 IDS26B 


3.50 


34 IOS34B 


4.50 


40 IOS40B 


5.40 


50 IDS50B 


6.50 


.1" Spacing. Crimps onto cable with 


ordinary vise & mounts to header sold 


above. 





ORDERING INFORMATION 

Prepaid orders over $50 shipped prepaid via 
UPS. All others add $3.00 for handling. VISA, 
MC, COD's and open account orders will be 
charged freight. $15 minimum order. $100 
minimum open account order. 





WIRE KITS 






Kit No. 


1 


- $9.95 




250 


3" 




100 


4Vi" 


200 


3%" 




100 


5" 


100 


4" 




100 


6" 




Kit No. 


2 


- $24.95 




250 


2Vi" 




250 


5" 


500 


3" 




100 


5W 


500 


3Vi" 




100 


6" 


500 


4" 




100 


6'A" 


250 


4'/i" 




100 


7" 




Kit No. 


3 


- $34.95 




250 


2Vt" 




500 


4Vi" 


500 


3" 




500 


5" 


500 


3Vi" 




500 


5'/j" 


500 


4" 




500 


6" 




Kit No. 


4 


- $59.95 




500 


2Vi" 




1000 


4y 3 " 


1000 


3" 




1000 


5" 


1000 


3'/i" 




1000 


5Vi" 


1000 


4" 




1000 


6" 


















DISCOUNT SCHEDULE 


Order 


Amount Discount and the name of 


$15 ■ 99 


Net this magazine must be men- 


100 - 199 


less 10% Honed at time of order to get 


200 - 499 


less 15% discount. Discount applies 


500 - 999 


less 20% on a " items except as noted, 


1000 up 


less 25% " No Discount." 



CIRCLE 46 ON FREE INFORMATION CARD 



page 1858 EVERGREEN • DUARTE. CALIFORNIA 91010 • TELEPHONE (213) 357-5005 



PMC PERSONAL COMPUTER 

(deal for small businesses, schools, colleges, homes, ate. 
Suitable lor the oxpertancod. inexperienced, hobbyist. 

EG3000 




landed I 



', user RAM 
K MicrnsoO 
BASIC in ROM • FuHv TRS-8Q Level II 
software compatible • Huge 
rangcoF software already available • Self contained, PSU, 
UHF modulate*, and cassette • Simply plugs into video 
monitor or UHF TV •Full expansion to disxs and printer 
• Absolutely complHie - iust fit mio mains plug. 




COMPUTER 
POWER TNA 7 
ONCE FILLED A ROOM 
CAN NOW BE CARRIED tN YOUR POCKET* 

• Programs in BASIC •"QWERTY" Alphabetic 
Keyboard »1J3K Random Access Memory 

• Long Battery Life- 



TV GAME BREAK OUT KIT 

Has got to be one ol The world's 
greatest TV flames You really get 

honked Has also 4 other pinball 
games nnd lots ol options. 
Good ku for upgrading old 
omusemenl games 

MINI KIT PCB. sound ft vision modulator, memory chip 
and de code chip Very simple to construct #30.00 
OR PCB *6.00 MAIN LSI #17.00 




74LSO0 
75LS04 
74LS05 
74LS1Q 
74LS32 



#0.15 
S0.15 
S0.20 
W.29 
10.35 



TTL SALE 

74LS74 M.« 

74LS86 M.EE 

74LS93 W.90 

74LSIS7 M.20 

74LS165 M.7S 



74LS365 M.7B 

74LS373 «.J0 

Z80A #5.50 

ZBO #4.20 

REG 7805 #0.90 



LOOK! 



MICROAGE/ 
SINCLAIR USERS 



SOCKETS LOW PROFILE 

14 PIN #0.10 IS FIN' #0.15 24 PIN #0.25 

16 PIN #0.10 20 PIN #0.15 40 PIN #0,30 

10V Power Adapter 600ml #0.90 UHF Modulators #0.90 



GET YOURSELF A NEW EPSON 

MX80 & MX70 PRINTER AND 
SAVE A FORTUNE 

Price on application 
Interface Cards tor Apple. 
Pel. TR380, and PMC - 
P.S232 Interface Cards not 
necessary for parallel 

Full TRSS0 




COMP PRO MIXER 




Professional 

audio mixer 

that you can 

build yourself 

and save 

over $200. 

Onlv $199 for 

complete kit. 



POSTAGE 
#20 



ACCESSIT AUDIO ADDONS 



8K FLOATING POINT 
SUPER ROM PACK 

ONLY $35 



WITH NEW MANUAL 



MICROAGE/SINCLAIR 
VIDEO UPGRADE KIT 



Only runs with NEW ROM 
[Smooth screen display I 



ONLY $29 



MICROAGE/SINCLAIR 

16K RAM PLUS 
EXPANSION BOARD 



3 SLOTS WITH EXTRA POWER SUPPLY 

--„ ONLY 
I OH 



$149 



4K $110 




UlkrofkeJ 



A COMPLETE 
COMPUTER 



A new 

generation of 

miniature 

computers 

2K Kit ONLY $149 
Post and Packing FREE 

Sinclair is 3 Registered Trademark of Sinclair Research Ltd- 



LMkroficoJ 



■rrrp Please make checks and money orders payable to MlcroAce or phone your order quoting Master Charge, Visa, 
J JS, Diners Club or American Express number for immediate despatch. Add 6% Tax for Shipments inside California. 
rlliCS. Micro Ace, 1348 East Edinger, Santa Ana, California, Zip Code 92705. Telephone: (714) 5472526 



CIRCLE 51 OK FREE INFORMATION CARD 



ALTEX ELECTRONICS 



818 W Sunset 

Sen Antonio, T»*a» 

78216 



In Texas Call 
(512)826-0503 



1-800-531-5369 



$3.95 



* 



S0NALERT 

Mallory 5NP-428 
4-28 VDC, 3-16 ma 
Fits 1 1(16" hole 



ff SEMICONDUCTORS 

%s. Diode MR 11 3QR, 12 Amp 
• 1000V, DO-4 SI. 25 
DIODt BU ,,„. PN2222A. TO-92 

PN2222A 10 (of j t M 10Q |()r tJJX 

■ ■ SCR 30V, 800 ma TO-92 
m 10 for SJ ,oo, 100 lor si 5.00 
SOU T f'ac MAC 10-4 




TERMS 

Quantities Limited 

COP, check, money order 

\ ISA, Mastercard 

lev. res. add 5! : slate 

-.ales lax. Add S3. 00 shipping 

charges for orders under S50 



$1.00 -^ 



Capacitors - Axial Lead 

20OMId 100 volt 1 5*8 x 7/8 $1.00 

250 Mid 150 volt 2 5/8x7/8 S1.00 

370 Mid 200 volt 3 578 x 1 St.00 

450 Mid 250 volt 3 5/8x1 11.00 

700 Mid 100 volt 15/8x7/8 $1.00 



PRINTED CIRCUIT BOARDS 
2 OI, copper clad one side 
1/16" FR-4 glass epoxy 



4 5" 
6,0" 
6.0" 
12 0" 



6.5" 
6 0" 
12 0" 

120" 



si.oo 

$1.25 
12.25 
54.25 



* 



JOYSTICK 
4-10K linear pots 

1 1/2" metal 
handle 
dimensions 

2 1(8" square 
$5.95 



POWER CORDS 

2 cond 18 ga 92" long grey 

3 cond. Belden 17629B 14 ga. 
long black type SJ , $2.85 



50c 
108" 



SPEAKERS 

8 ohms 



m 



1 1/2" 
12 

12" 
15" 



TP-151 

12 LA10 
12LA20 
15 LA20 



.1W 
25W 
SOW 

SOW 



$1,00 

$12.00 

$18.00 



CONNECTOR 
RS-232 
connector, 
DBC-25-P male. 
crimp pin. S2.25 
DFJ-25 cover 
$1.25 



# 



POWER 
SUPPLY 



Inpul *«-, r- rt 

"VJ P T C $67.50 

+ 5VDC -5 Amp 
+ 12VDC - 1 Amp 
- 12VDC - Amp 

5 3/4" x 7 1/2""x4"h 



DYNAMIC RAMS 

D2104A 16 pin 4Kx1 300ns 
TMS4030 22 pin 4Kx1 300ns 
95c 

PROM 

7640 24 pin 512 x 8 VOL OC 
S7.95 

UART 

COM 2502 40 Din 25 KHi +5-12 
$4.95 



COIL 

6KV trigger 
coil for strobe 
$1.25 



SNAP ACTION SWITCHES Arm length 
Micro Switch V3L-2108-D8 2 3/8 

10 Amp. 125 VAC SPDT . $1,00 Arm lenglh 
Unimax 2HBT-5 20 Amp i a/4 

125 VAC SPDT, . SI. 50 




TRANSFORMERS 
PS400A 110-220 VAC Pri 

26 5 VCT Sec, v I 5 Amps 

2 3/8" x 3 5'fl ' x 2 1(4" h 
mourning holes 3 1'8 CC 
$7.95 

P5800A UO-220 VAC Pn. 
50 VCT Sec., si 2 Amps 

3 112" x 3 1/8" x2 7/8" h 

mounting holes 2 1/2" * 2 3'8 
$14.95 



tfiJ 



SOLDER 
Kesler 60(40 

020 Oia 
1 lb roll 

$7.95 



SLIDE 
CONTROL 

PCB mounl. 
10K linear. 
1 3/4" Iravel 

75C 



EDGE 

CONNECTOR 
43/86 pin 

(double) 
156 spacing 
gold plated 
solder eyelels 

$3.95 



%> 



JACK 

Switchcralt 
» 12A 1/4" 
phone iack 
w/switch 
25* each 



AUDIO 
CASSETTES 
C-30 Memorex 

ATC 
|15 mm, 
per side) 



each . 



SO* 



box of 
50 . . $20 



EDGE METER 

015 V.O.C 
25/32" H 13/16" 

$3.50 



POTS 

All with 3/8" shall 

All below without switch 

VALUE 

IK Linear 

5K Linear 

10K Linear 

25K Linear 

50K Linear 

50K Audio 

1O0K Linear 

500K rev arse audio 

1M Linear 

All below with Switch 85c 

25K Linear/push-pull 

50K Linear/push-pull 

500K Linear/turn 

50 K Audio/turn 



,75c 

STHE 

B 

B.C 
A.B.C 

&.'"; 

AC 

c 

B,C 
B 
B 

B 
B 
B 
C 



# 



CIRCLE 64 ON FREE INFORMATION CARD 



OUTDOOR AUTOMATIC LIGHTING WITH PASSIVE INFRARED 

SECURITY LIGHT CONTROL 



t \ \ 







Amazing infrared device detects and foils intruders, 
welcomes guests, prevents accidents and saves energy! 



Your family is sound asleep. An in- 
truder is stealthily approaching your 
darkened house. But when he enters 
the detection pattern, the SLC senses 
his body heat and ZAP! Your outside 
lights come on instantly, destroying 
his cover of darkness before he ever 
gets to your door. A crime is prevented. 
And when you finally arrive home that 
same SLC automatically turns on your 
driveway and porch lights for a safe, 
warm welcome. 

HOW IT WORKS 

This exciting new product incor- 
porates the latest advances in heat- 
sensing infrared technology. Manufac- 
tured by Colorado Electro-Optics, the 
leading producer of infrared security 
devices in the US, the SLC detects the 
heat energy of any person or vehicle 
that enters its invisible detection pat- 
tern. It will then automatically turn on 
up to 500 watts of outside lighting. 
These lights will remain on until four 
minutes after the last person leaves the 
detection area No timers, no switches, 
no all-night flood lights. 

SLC NEVER FORGETS 

Unlike timers that respond only to 



preset programs, the SLC reacts to the 
presence of human beings. It is now 
possible to have your lights on when 
and only when you really need them. 
all automatically. In addition to a relia- 
ble security device, the SLC can pro- 
vide your family with increased safety, 
convenience and home energy savings. 
No more stumbling over unseen ob- 
jects, tripping on dark stairs, or fum- 
bling with your keys. No more wasted 
energy from forgetting to turn off the 
lights. And yourguests will appreciate 
the automatic welcome your home 
always provides. 

SAFE, EASY TO INSTALL 

The SLC does not emit energy of 
any kind and is totally harmless to liv- 
ing things. Rugged, weather resistant, 
UL listed and good looking, a low-cost 
SLC should be put near every entry- 
way. The sensor is adjustable to cover 
an area 35 feet by 25 feet. Installing the 
SLC is as simple as wiring a switch, an 
easy job for the do-it-yourselfer. 

Your home is an important invest- 
ment, and your family is irreplaceable. 
They deserve the sophisticated protec- 
tion of the Security Light Control. 



Colorado 



A DIVISION OF LINEAR CORP. 



Electro-Optics, inc. 



SLC ORDER FORM 

If not completely satisfied I may return 
the SLC within 60 days of purchase for a 
full refund. The unit carries a limited one 
year warranty. 

Please Print 

name 



ADDRESS 



CITY 



STATE 



Please send me Security Light Con- 
trol (s) at $199 each, totalling $ 



For my convenience, Colorado Electro- 
Optics will pay surface shipping charges. 

Enclosed is my □ Money Order 
D MasterCard or □ Visa 

account no . . 



EXPIRATION DATE 



□ Personal Check 
D Ship COD to above address 
(10% deposit enclosed) 



□ Please send more information. 
sig nature . 

Colorado Electro-Optics, inc. 

2200 Central Ave., Dept. R 
Boulder, Colorado 80301 
(303) 494-3200 



CIRCLE 42 ON FREE INFORMATION CARD 



O 

< 
m 

m 

3J 



123 



16K Memory 

ALL MERCHANDISE 100% GUARANTEED! 



41 16-200ns 



8/17.50 



LS SERIES 



74LSO0 

74LS01 

74LS02 

74LS03 

74LS04 

74L505 

74LSOS 

74LS09 

74LS10 

71 LSI 1 

74LSI2 

74LS13 

74LS14 

74L515 

74LS20 

74LS2I 

74LS22 

74LS26 

74LS27 

74LS2B 

74LS30 

74LS32 

74LS33 

74LS37 

74LS3B 

74LS40 

74L542 

74LS47 

74LS48 

74LS4S 

74L3S1 

74LS64 

74LS55 

74LS63 

74LS73 

74LS74 

74LS75 

74LS76 

74LS7S 

74LSS3 

74LS8S 

741586 

741590 

74LSS1 

74LS92 

74LS93 

74LS95 

74LS96 

74LS107 

74L5109 

74LS112 

74L.SI13 

74LS114 

74L5122 

74LS123 

74 LSI 24 

74LS125 

74 LSI 26 

74LS132 

74LS135 

74LSI37 

74LS138 

74LS 1 39 

74LS146 

74LS147 

74LSI48 

74LSI51 

74LS153 

74 LSI 54 

74LS155 

74LS156 

74LS157 

741.8168 

74LS160 

74.LS161 

74LS162 

74LS163 



.26 

25 

.25 

25 

26 

.25 

35 

.25 

.25 

.35 

.35 

.45 

1.00 

35 

.25 

.35 

.25 

35 

35 

.35 

.25 

.35 

.55 

.55 

.35 

.25 

.55 

.75 

75 

75 

.26 

36 

35 

1.2S 

40 

.45 

.50 

.40 

.50 

.75 

1.15 

40 

65 

89 

.70 

.65 

.85 

.96 

.40 

40 

.45 

.45 

.50 

.45 

.95 

299 

95 

.95 

.76 

.55 

99 

.75 

.75 

1.20 

2 49 

1.35 

.75 

.75 

2.35 

1.15 

95 

.75 

75 

.90 

.95 

.95 

.96 



74LS164 


95 


74LS 1 65 


.95 


74LS166 


2.40 


74LS188 


1.75 


74LS169 


1.75 


74LS170 


1.75 


74LS173 


.60 


74L5174 


95 


74LS175 


.95 


74LS181 


2.15 


74LS189 


9.95 


74LS 1 90 


1.00 


74LS191 


1.00 


74LS192 


.95 


74LS193 


.95 


MLS 1 94 


1.00 


74LSI95 


95 


74LS198 


.85 


74LS197 


85 


74LS221 


1.20 


74LS240 


1.35 


74LS241 


1.55 


74LS242 


1.56 


74LS243 


1 85 


74LS244 


1.75 


74LS245 


2.85 


74LS247 


.76 


74LS24B 


1.25 


74LS249 


.99 


74LS251 


1.30 


;-'.LS?5n 


85 


74LS257 


.86 


mls :5a 


.86 


74LS25S 


2.85 


74LS280 


.65 


74LS236 


.56 


74LS273 


1.65 


74LS275 


3.35 


74LS279 


.55 


74LS280 


1.98 


74LS2S3 


1.00 


74LS290 


1.25 


74LS293 


1 65 


74LS295 


1.05 


74LS299 


1.20 


74LS324 


1.75 


74LS352 


1.55 


74LE353 


1.55 


74LS363 


1.35 


74L5364 


1,95 


74LS365 


.95 


74LS368 


.95 


74LS367 


.70 


74LS368 


.70 


74LS373 


1.85 


74LS374 


1.80 


74LS377 


1.45 


74LS378 


1.18 


74LS379 


1.35 


74LS38S 


1.90 


74LS386 


65 


74LS390 


1.90 


74LS393 


1.90 


74LS396 


1.65 


74LS399 


1.70 


74LS447 


.37 


7415490 


1.95 


74LS66B 


1 69 


MLS 669 


1 89 


74LS670 


2-20 


74LS674 


9.65 


74LS682 


3.20 


74LS683 


2.30 


74LS884 


2.40 


74LS685 


2.40 


74L56B8 


2.40 


74LS6S9 


2,40 



LINEAR 



LM301V 

LM308V 

LM309K 

LM31I 

LM3I7T 

LM317K 

LM318 

LM323K 

LM324 

LM337K 

IM339 

IM377 

LM380 

LM386V 

LM555V 

LM558 

LM565 

LM588V 

LM5S7V 

LM723 

LM733 



.34 

98 
1.49 

.64 
1.95 
3.95 
' 49 
4.95 

59 
395 

99 
2.29 
1.29 
1 50 

39 



1.49 

1 29 

49 

98 



L.M741V 

LM747 

LM74SV 

LM1310 

MCI330V 

MC1350V 

MCI 369 

LMt414 

LM 1 458V 

LM14S8 

LM1489 

LM1S00 

LM1S89 

LM3900 

LM3909V 

LM3914 

LW391 5 

LM3916 

7545IV 

764S2V 

76453V 



.79 

69 

2.90 

t 89 

1.29 

1.79 

1 59 

69 

99 

99 

2.99 

2.49 

59 

98 

395 

395 

395 

39 

39 

39 



8200 



0202 

9205 

9212 

9214 

3218 

8224 

8226 

8226 

8237 

8239 

8243 

8250 

8251 

6253 

625 3- 5 

8265 

9255-5 

6257 

6259 

6272 

9275 

9279 

92 79-5 

8282 

3283 

8264 

8286 

8287 

8268 

8289 



6800 



6600 
5802 
6909 
3910 
6320 
6821 
8828 
6834 
6340 
6343 
6844 
6845 
6847 
6850 
8862 
8880 
8362 
6S71 
6875 
6830 



6.95 

11.95 

37.95 

4.60 

4.95 

4.95 

9.95 

16.95 

14.95 

42.55 

44.95 

2995 

16.95 

4.75 

5.75 

10.95 

11.95 

25.95 

6.95 

2.95 



1702 

2708 

2758 

TMS2516 

2716 

2716-1 

TMS2716 

TMS2532 

2732 



2101 

2102-1 

21L02-1 

2111 

2112 

2114 

2114L-2 

2114L-3 

2114L-4 

TMS4044-4 

TMS4044-3 

TMM2016 

HM6116 



4027 

4116-150 

4116-200 

4116-300 

4164 



MPU'S 



45.00 

3.50 

1.95 

3.90 

1.85 

2.50 

1 85 

4.95 

19.95 

4.95 

4.50 

14.95 

5.50 

9 95 

9.95 

5.25 

5.25 

9.00 

7.00 

39.96 

29.95 

10.50 

10,50 

B65 

6.65 

5.80 

8.65 

6.85 

25.00 

49.95 



8035 

8039 

80S0A 

8035 

3038 

8039 

8155 

8156 

3135 

8185-2 

8741 

3748 

3755 



16.95 
19.95 
3 95 

12 95 
99.95 
39 95 
11 95 
11 95 
29.95 
35-95 
39.95 
39.95 
49 95 



Z80 



280 
Z80A 
2808 
ZSO-PIO 

280A-PIO 

280- CTC 

Z80A-CTC 

Z80-DABT 

Z80A-DART 

Z800MA 

Z80A-DMA 

Z80-SIO/0 

280A-SIO/0 

ZSO-SIO/l 

ZSOA-SIO/1 

Z80-SIC2 

Z80ASILV2 

Z80-SI0/9 

Z80A510/9 



8.95 
9.95 
19.95 

6.50 
8.60 
6.50 
8.65 
15.25 
18.75 
17.50 
27.50 
23.95 
28.96 
23.95 
28.95 
23.95 
28.95 
17.95 
22.95 



T.V. 
CIRCUITS 



MCI 330 

MCI 350 

MC1358 

LM390 

LM386 

LM565 

LM741 

LM1310 

LM1B00 

LM ■ BB9 



1.89 
1.29 
1.79 
1.29 
t.SO 
.99 
.29 
2.90 
2.99 
2.49 



EPROMS 



256 x 8 
1024 x 8 
1024 x a 
2048 x 8 
2048x8 
2048 x 8 
2048 x 8 
4096 x 8 
4096 x 8 



[lus) 
(460ns) 
(450nsK5v) 
|4S0nsH5v) 
(450ns)i5v] 
(350nsX6v| 
(450ns) 
[450ns)(5v| 
(460nsK5v) 

STATIC RAMS 



256 x4 
1024 x 1 
1024 x 1 
256 x 4 
256x4 
1024 x 4 
1024 x 4 
1024 x4 
1024 i4 
4096 x 1 
4096 x 1 
2048x8 
2048 x8 



(450ns) 

(460ns) 

(450nsKLP) 

(460ns) 

(450ns) 

(450ns) 

[200nsXLP) 

(300ns)(LP) 

(460nsKLP) 

(450ns) 

|300ns) 

(200ns) 

(200ns) 



CALL US FOR VOLUME QUOTES 

JDR MICRODEVICES. INC IS PROUD TO 

ANNOUNCE THE OPENING OF OUR 

NEW RETAIL SHOWROOM 

BAY AREA RESIDENTS 
STOP BY 1224 BASCOM AVE. 



MISC. 



8T28 


2.49 


AYS-1013 3.95 


8T95 


.99 


TR1602 


4.96 


8T96 


99 


IM6402 


7.95 


8T97 


99 


1771 


24.95 


8T96 


.99 


1791 


36.95 


1489 


.99 


1793 


49.95 


1489 


.99 


UPD7B6 


39.95 


DM8131 


2.95 


8272 


39.95 


14411 


9.95 


74C923 


5.95 



TRANSISTORS 



PN2222 
2N3904 
2N3906 
2N30S5 
IN4149 
IN 400 4 



1071.00 
10/1 .00 

10/1.00 
.79 



6502 



6802 


6.95 


6502A 


12.95 


6504 


6.95 


6505 


S.95 


6520 


4.95 


6522 


9.95 


6532 


14.95 


6561 


14.95 



4.95 

395 

9.95 

7.95 

5.95 

1295 

995 

19 35 

16.50 



1.95 

,89 

1.29 

2.99 

2.99 

B/17.95 

8/2296 

6/21.95 

8/18 95 

3.49 

3.99 

CALL 

CALL 



DYNAMIC RAMS 



4096 k 1 
18.384 x 1 
16.384 X 1 
16,384 x 1 
65.536 x 1 



(250ns) 
(150ns) 
(200ns) 
(300ns) 
(200ns) 



250 

8/19.95 

8/17.50 

8/16 95 

CALL 



Spci 

4.50 

350 

8.95 

695 

5.50 

11.95 

8.95 

17.95 

15.96 

irjrjpcs 
1.85 
.85 
LIS 
2 49 
2.79 
2.10 
2.45 
2 45 
2.25 
3.25 
375 



100pci 
2.00 
2.35 
1.95 
1 85 



l 00/B.99 
1 00/9.99 
1 00/8.99 
10/6 99 
25/1 .00 
10/1.00 



MA1012A 
CLOCK MODULE 

W RED LED CHARACTERS 

12-HOUR FORMAT 

FACTORY ASSEMBLED 

JUST ADD SWITCHES 

COMPLETE WITH SPECIAL 
TRANSFORMER AND SPECS. 

$8" ea. 3/$24 00 



CALL JDR BEFORE YOU BUY! 
WE WILL BEAT ANY COMPETITORS PRICES. 

800-538-5000 
800-662-6233 



iCAllFOflNlA RESIDENT^ 



DIP SWITCHES 



A position 

5 position 

6 position 

7 position 

B position 


.85 
.90 
.90 
.96 

.95 


CONNECTORS 


RS232MALE 
RS232 FEMALE 
RS232 HOOD 
S-100ST 
S- 100 WW 


3.25 
3.75 
1.25 
3.95 
4.95 



VOLTAGE REG'S 



LEDS 

JumboRed 10J1.00 
Jumbo Green 611.00 
Jumbo Yellow 6:1.00 
5032-7760 ,43'CC .79 
MAN74 3'CC .99 
MAN72 3'CA 99 



IC 

SOCKETS 

1-100 10QpdS 
.13 .11 



7S0ST 
7BOBT 
731 2T 
781 5T 
7824T 



as 
.99 



7905T 
7912T 
79 1ST 

7924T 



7605K 1 39 7905K 

7812K 139 791 2K. 

781 5K 139 79105 



78L05 
78L12 

78L15 

LM309K 

LM317T 



.89 79L12 
.69 79U5 
,69 LM317K 



1.49 
1.9$ 



LM323K 
LM337K 



.99 
99 

1-19 
1 19 



1 49 

.79 

.79 
.79 

3.95 

4:95 
3.95 



a pin ST 
14 pin SI 
16 pin ST 
18 pin ST 
20 pin ST 
22 pin ST 
24 pin ST 
28 pin ST 
40 pin ST 



.15 
.17 
.20 
.29 
.30 
.30 
.40 
.49 



ST = SOL0ERTAIL 

r..r-. IAIIAJ r,|-| 



.12 

13 
18 
.27 
.27 
.27 
32 
.39 



T^TO-220 C=TO-3 L=TO-92 



Spin WW 

14 pin WW 
16 pin WW 

15 pin WW 
20 pin WW 
22 pin WW i..ki 
24 pin WW 1,49 
28 pin WW 1.69 
40 pin WW 1.99 



.59 
.69 
.69 
.99 
1.09 
1.39 



.49 
.52 
.58 
.90 
98 
1.28 
1.35 
1.49 
1.80 



LP=lOW POWER 



WW = WIREWRAP 




JDR MTCRODEVICKS, INC. 

1224 So Ba5corn Ave 

San Jose. CA 95128 

800 538-5000 • 800-662 6233 (Calif.) 

008247-4852 



TERMS F« shipping include $2 00 tor UPS Ground. $300 loi 
UPS Blue Larjol Air 510 00 minimum order Bay Area Resi- 
dents add S'.j^i sales tax California Residents add 6% sales 
tax We reserve Ihe right lo limit quanhlies and substitute 
manufacturer Prices subject lo change without nolice 
Send SASE for complete list 



124 



CIRCLE 4S ON FREE INFORMATION CARD 



2716 



EPROMS 450NS (5V) 



8/5.50 



ALL MERCHANDISE KM/'/,. GUARANTEED! 



CALL US FOR VOLUME QUOTES 



CMOS 



74O00 


,3S 


74C374 


2.75 


4013 


.45 


4098 


249 


74C02 


,35 


74C901 


.80 


4020 


.95 


4099 


1.95 


74C04 


J5 


74C902 


.85 


4021 


.95 


14409 


8.35 


74C08 


.35 


74C903 


.85 


4022 


1.15 


14410 


8.35 


74C10 


.35 


74C905 


10.95 


4023 


.35 


14411 


9.95 


74C14 


1.50 


74C906 


.95 


4024 


75 


14412 


12.95 


74C20 


.35 


74C907 


1.00 


4025 


.35 


14419 


2.95 


74C30 


.35 


74C908 


2.00 


4025 


1.65 


4502 


.95 


74C32 


.50 


74C909 


2.75 


4027 


,es 


4503 


.65 


74C42 


1.75 


74C910 


9.95 


4028 


.so 


4508 


1.95 


74C48 


2.10 


74C911 


10.00 


4029 


.95 


4510 


.95 


74C73 


,65 


74C912 


10.00 


4030 


.45 


4511 


,95 


74C74 


.85 


74C914 


1.95 


4034 


2,95 


4512 


,95 


74C7S 


.80 


74C915 


2.00 


4036 


.85 


4514 


1.25 


74083 


1.95 


74C918 


2.76 


4040 


95 


4515 


2.25 


74C85 


1.95 


74C920 


17.96 


4041 


1.25 


4516 


1.55 


74CBG 


,95 


74C921 


15.95 


4042 


.75 


4518 


1.25 


74C89 


4.50 


74C922 


5.95 


4043 


.85 


4519 


1.25 


74C90 


1.75 


74C923 


5.S5 


4044 


65 


4520 


1.25 


74C93 


1.75 


74C925 


6.75 


4046 


.35 


4522 


1.25 


74C95 


1.75 


74C926 


7.95 


4047 


,95 


4526 


1.25 


74C107 


1.00 


74C927 


7.95 


4049 


.55 


4527 


1.95 


74C1SO 


5.75 


74C928 


7.95 


4050 


.55 


4528 


1.25 


74C151 


2.25 


74C929 


19.95 


4051 


.95 


4531 


.95 


74C154 


3.25 


74C930 


19.95 


4053 


.95 


4532 


1.95 


74C157 


1.75 


4000 


.35 


4080 


1.45 


4538 


195 


74C16C 


2.00 


4001 


.35 


4086 


76 


4539 


1.95 


74C181 


2.00 


4002 


.25 


4068 


.40 


4543 


2.70 


74C182 


2.00 


4008 


.95 


4069 


.35 


4555 


.95 


74C1S3 


2.00 


4007 


.29 


4070 


.35 


4556 


.95 


74C164 


2.00 


4008 


95 


4071 


.30 


4581 


1.95 


74C1BS 


2.00 


4009 


.45 


4072 


.30 


4582 


1.95 


74G173 


2.00 


4010 


.46 


4073 


30 


4584 


.95 


74C174 


2.25 


4011 


.35 


4075 


.30 


4685 


.95 


74C175 


2.25 


4012 


.25 


4076 


95 


4702 


12.95 


74C192 


2.25 


4013 


.46 


4078 


.30 


4724 


1.50 


74C193 


2 25 


4014 


.95 


4081 


.30 


80C07 


.95 


74C195 


2.25 


4015 


.95 


4082 


.30 


80C96 


.85 


74C200 


5,75 


4016 


.45 


4085 


.95 


80096 


.95 


74C221 


2.25 


4017 


1.15 


4096 


.95 


80C97 


,95 


74C373 


2.75 


4013 


.95 


4093 


.95 


80C93 


1.20 







74S00 SERIES 








74SO0 


.44 


74S74 


.69 


74S163 


3.75 


74S258 


1.49 


74S02 


.48 


74S85 


2.39 


74S168 


4.65 


74S260 


1.83 


74S03 


.48 


74 $86 


1,44 


74S169 


5.44 


74S274 


19.95 


74S04 


.79 


74S112 


1.59 


74S174 


1.09 


74S27S 


19.95 


74S05 


79 


74S113 


1.98 


74S175 


1.09 


74S2BO 


2.90 


74 SOS 


.48 


74S114 


1.50 


74S181 


4.47 


74S287 


4.75 


74S09 


.98 


74S124 


2,77 


74S1S2 


2.95 


74S288 


4.45 


74S1D 


.69 


74S132 


1,24 


74S188 


3.9S 


74S289 


6.98 


74S11 


.88 


74S133 


.96 


74S189 


14.95 


743301 


6.95 


74915 


.70 


74S134 


.69 


74S194 


2.95 


74S373 


3.45 


74S20 


.68 


74S135 


1.48 


745195 


1.89 


74S374 


3.45 


74S22 


.98 


74S13S 


1.08 


74S196 


4.90 


74S381 


7.95 


74S30 


.48 


74S139 


1,25 


74S197 


4.25 


74S387 


S.75 


74S32 


.98 


74$ 140 


1.45 


74S201 


14.95 


74S412 


2 98 


74S37 


1.87 


74S151 


1.19 


74S225 


895 


74S471 


9.95 


74S38 


1,68 


74S163 


1.19 


74S240 


3.98 


74S472 


16.86 


74S40 


.44 


74S157 


1.19 


74S241 


3.75 


74S474 


17.85 


74S51 


.78 


74S158 


1.45 


74S251 


1.90 


745482 


15.80 


74S64 


.79 


7-4S1B1 


2.B5 


74S253 


7.45 


74S570 


7.80 


74S65 


1.25 


74S182 


3.70 


74S257 


1.39 


74S571 


7.80 



PROMS 



74S188 


(82S23) 


OC 


32x8 


3.95 


74S287 


(82S129) 


TS 


256x4 


4.75 


74S288 


(82S123) 


TS 


32x8 


4.45 


74S387 


(82S126) 


OC 


256x4 


5.75 


74S471 




TS 


256x8 


9.95 


74S472 


(82S147) 


TS 


512x8 


16.85 


74S474 


(82S141) 


TS 


512x8 


17.85 


74S570 


(82S130) 


OC 


512x4 


7,80 


74S571 


(82S131) 


TS 


512x4 


7.80 





7400 SERIES 




7400 


19 


74128 


,55 


7401 


.19 


74132 


.45 


7402 


.19 


74136 


.50 


7403 


.19 


74141 


.65 


7404 


.19 


74142 


2.95 


7405 


.22 


74143 


2.95 


7406 


.22 


74144 


2.95 


7407 


.22 


74145 


.80 


7408 


.24 


74147 


1.75 


7409 


.19 


74148 


1.20 


7410 


.19 


74150 


1.35 


7411 


.25 


74151 


.65 


7412 


.30 


74152 


.65 


7413 


.35 


wis; 


.55 


7414 


.55 


74154 


1.40 


7416 


.25 


74155 


.75 


7417 


.25 


74156 


.65 


7420 


.19 


74157 


.55 


7421 


.35 


74159 


1.65 


7422 


.29 


74160 


.85 


7423 


.29 


74161 


,70 


7425 


.29 


74162 


65 


7426 


.29 


74163 


.85 


7427 


.29 


74164 


.as 


7428 


.45 


74165 


.85 


7430 


.19 


74166 


1.00 


7432 


.29 


74167 


1.95 


7433 


.45 


74170 


1.65 


7437 


39 


74172 


5.95 


7438 


sa 


74173 


.75 


7440 


19 


74174 


.89 


7442 


.49 


74175 


.89 


7443 


.65 


74178 


.89 


7444 


.69 


74177 


.75 


7445 


.69 


74178 


1.15 


7446 


.59 


74179 


1 75 


7447 


.69 


74180 


75 


7448 


.69 


74181 


2 25 


7450 


.19 


74182 


75 


7451 


.23 


74184 


2.00 


7453 


.23 


74185 


2.00 


7454 


.23 


74186 


18.50 


7460 


.23 


74190 


1.15 


7464 


.39 


74191 


1,15 


7465 


.39 


74192 


.79 


7470 


35 


74193 


.79 


7472 


.29 


74194 


.85 


7473 


.34 


74195 


.85 


7474 


.35 


74198 


.79 


7475 


.49 


74137 


.75 


7476 


.35 


74138 


1.35 


7480 


.59 


74199 


1,35 


7481 


1.10 


74221 


1.35 


7482 


95 


74246 


1,35 


7483 


.50 


74247 


1.25 


7484 


.50 


7424B 


1.85 


7485 


.65 


74249 


1.95 


7486 


.33 


74251 


.75 


7489 


4.95 


74259 


2.25 


7490 


.35 


74265 


1.35 


7491 


40 


74273 


1.95 


7492 


.50 


74276 


1.25 


7493 


.49 


74279 


,75 


7494 


.65 


74283 


2.00 


7495 


.55 


74284 


3.75 


7496 


.70 


74285 


3 75 


7497 


2-75 


74290 


95 


741O0 


1,00 


74293 


,75 


74107 


JO 


74298 


85 


74109 


.45 


74351 


2.25 


74110 


.45 


74365 


.65 


74111 


.55 


74366 


.65 


74116 


1.55 


74387 


65 


74120 


1.20 


74368 


.65 


74121 


.29 


74376 


2.20 


74122 


.45 


74390 


1.75 


74123 


.55 


74333 


1.35 


74125 


.45 


74425 


3.15 


74126 


45 


74426 


.65 






74490 


2.55 



NEED FAST PARTS? 






DYNAMIC RAMS 




4116 


150NS 


16Kx1 


8/19.95 


4116 


120NS 


16Kx 1 


8/29.95 




STATIC RAMS 




2147 


55NS 


4Kx 1 


9.95 


6116 


150NS 


2Kx8 


CALL 


6116 


120NS 


2Kx8 


CALL 




EPROMS 




2716-1 


350 NS 


2Kx8 


12.95 


2732A 


250 NS 


4Kx8 


25.95 


2732A-2 


200 NS 
MPU'S 


4Kx8 


32.95 


Z-80B 


CPU 


6mHz 


19.95 


Z-80B 


CTC 


6mHz 


17.95 


Z-80B 


PIO 


6mHz 


17.95 


68B0O 


CPU 


2m Hz 


10.95 


68B21 


PIA 


2mHz 


12.95 


68B50 


ACIA 


2mHz 


12.95 


8085A-2 


CPU 


5mHz 


16.95 




APPLE OWNERS 

EXPAND YOUR 48K COMPUTER TO 64K 

SUPER RAM • II 

• PLUG INSLOT0 

• GOLD PLATED CONTACTS 

• INCLUDES 5 JUMPER OPTIONS 

- I NCLUOES 5 RAM ■ HO M OPT10 NS 

• ENJOY THE BEST OF BOTH WORLDS j 

- 1 6K RAMI RAN DOM ACCESS M EMORY! 

■ THIS IS SOPHISTICATED FIRMWARE 

■ EXPAN DS YOUR e6K APPLE TO 64K 
0^ PROGRAMMABLE MEMORY 

■ ELIMINATES THE NEED FOR APPLESOFT' OR INTEGER BASIC ROM 
CARD 

• ALLOW YOU 10 RUN APPLE'S MEW FORTRAN PACKAGE. ALSO 
PASCAL AND PILOT 

■ KEYBOARD CONTHOL SELECTION OF RAM OH MOTHER BOARD 
ROM LANGUAGE 

■ INCLUDES INSTALLATION INSTRUCT IONS AND APPLICATIONS 
NOTES 

• THE SOFTWARE 0EVELOPED BY VARIOUS VENDORS FOR YOUR 
(S4K) SHOULD NOW WORK AS THEY ADVERTISED 

• THE MOST VERSATILE RAM EXPANSION ON THE MARKET TODAY 
UNIQUE 1 YEAR WARRANTEE! $168.00 



APPLE FAN 



"COOL-IT" 
TAN COLOR 




• SAVE DOWN TIME 

- LONG LIFE MOTOR 

- LOW NOISE IS A MUST 

■ SAVE REPAIR CHARGES 

■ INCREASES RELIABILITY 
. CLIPS ON-NO HOLES OH SCREWS 

■ MINIMUM QUIETNESS IS DUE TO THE DHAW EFFECT OF AIH 
THROUGH YOUR COMPUTER AND A SPECIAL FAN AND MOTOR 
DESIGN 

- THOSE EXTRA PLUG IN CARDS CAN CAUSE EX.TFW HEAT 

HOW TO HOOK IT UP 

1 Cup '1 on your APPLE 

2 Unplug your 120V camv (you eronT need II) 

3 Piyn short 12QV cable from Super Fen II lo the Back of your computer 

4 Pius ine supply cable from Super Fen II <o your 1MV power eource 

5 Turn on In* roc Her 3*>lcri end a bullHn red reedy lifjfll comes on 
e You are en set "COOL IT" 

UNIQUE 1 YEAR WARRANTEE! $89.00 

'APPLE IS A TRADEMARK OF APPLE COMPUTER INC 



VISA* 



JDR MICRODEVICES. INC. 

1224 So. Bascom Ave. 
:,- t\ San Jose. CA 95128 

C B V 800-538 5000 • 800 662 6233 (Call I.I 

3 4082474852 



TERMS For shiuping incudoSJOO lur UPS Ground $3 00 10 
UPS Blur. L.IOi'l Air $1000 mimmufr "" 
denis add 6'.'% sales lax C.iHtornu 

IB! V 

manulaeiurer pric^.. ™ 
Send SAS6 lor domplelr? Iwl 



CIRCLE 48 ON FREE INFORMATION CARD 



125 



BiLLET ELECTB6IIC9 



P.O. BOX 401244R 

GARLAND, TX. 75040 

[214)278-3553 



Sound Effects Kit $18.50 



Hi: 



Ml 

.1 



1 heSE-01 ia jior^pnickillhjl 
ccmjrnt a>l Ifta n*fsa 1o build a 
pr ogn am mfthH sound arracta 
generator Dwiflneo around 1 

JH7W77 Sound CMp. In* 
board pro-idea fcan*» o4 MINI 
DIP awilch** and pcti u> 
program Una various eti-n- 
omii ksrt» er tn* st.F Ottiliirtor, 
VCO nkMt*. On* ShOL and 
Envelope C&n I roll A Quad Op 
Amp iC n used 1q impiernenl 
an ActjuaEaMa Pulta Genera- 
lew. Level Comparator and 
Multipla* OtCiHaJa/ rer aven 
mora varutililv Tin W * ET 
PC Board TvalurtVI a proEMype 
araa Id allow 1st uiar added 
circuMfy Eauif programmed 
to duplicate EaploiEoai, 
P hut z r Guns., Slum Tr iln |, Qf 
aJmott an inlinil* number at 
oiher aowide . Th* unit hat * 
mullipif of applicaEiont Thai 
low price Include* all park. 
lUambly manual, programming ch-ntti. and delniKrd 76477 chip 
Spec J cnhani I; rum on j 9V ball cry Jnol included) On beard 
100MW amp will dnve a small apeatar directly, or 1ne unit Can be 
conrtnemd to your Horoo wish incredible} result ISooakor mot, 
included}. 76477 Li Included. Avatlablq separately far $3.15 each. 



AY3-591D PROGRAMMABLE SOUND GENERATOR 

| The AY 3-6910 is a. 40 pin LSI chip wilh three oscillators, ihree 
amplitude controls, programmable noise generator, three 
mixe r i. an envelope fj en erator, and th r ee D/ A converters that 
are controlled by B BIT WORDS. No exlernal poti of caps 
required This chip hooked to an fl bfl microprocessor chip or 
Buss (3080 ZSG. &S00 £IC.) can be SOitwar? COnlrOtlad tO 
produce aim os! any sound. It wilt play three not* chords, mnkd 
bangs, whistles, sirens, gunshots, explosions, bloats, whines. 

I or grunts In addition, it has provisions la control its own 
memory chips with two tO ports, "Hie chip requires +5V jS 
Tfiffli and a standard TTL clock oscillator. A Iruly incredible 
circuit. 

£12-95 WYSasie Spec Sheet (4 pages) 

I 60 page manual with S-1C-0 interface Instructions and 
several programming examples, $3.00 extra 



MANY OTHER COMPONENTS AND KITS AVAILABLE 
IN OUR COMPLETE CATALOG. CALL OR WRITE FOR 
.FREE CATALOG. 



Doomsday Alarm Kit $9*95 

IT you have trouble sleeping and you would like the rest of 
Ihe neighborhood to shara your misery then this little kit 
will fce for you 1 There is no way to accurately describe ihe 
unearthly howls, screams and tones that come out of this 
kit Four separate tone oscillators are mixed, cancelled 
and stepped at a vary i ng rale . 1 Watts of crazy sou n ds. A 
great fun kit or a practical burglar alarm. Complete wilh 
PC board and all necessary components less speaker. For 
6-12 VDC. ORDER DA-Ol 



Over voltage Protection Kit $6,95 

Protect your expensive equipment from overvollage 
conditions. Every computer should have one! Work* wttti any 
fund DC power source from 10 to 20 volt* up lo 25 amps. 



7 Watt Audio Amp Kit $5*95 

SMALL SINGLE HYBRID IC AMD COMPONENTS Fll OH A T' x 3" PC 
HOARD (INCLUDED] HUNS ON I2VOC GREAT FOR AMY PROJECT THAT 

HEEDS AN INEXPENSIVE AMP LESS THAN 3% THC g> 5 WATTS 
COMPATIBLE WITH SE-D1 SOUND KIT 



Stereo AMP/Power Supply Board 

Takes low level audio and drives B ohm speakers ON- 
BOARD Rectifiers and Filter supply power for AMP 
AND TUNER, VOLUME. BALANCE, 
PLUG COMPUTABLE and TONE SLIDE CONTROLS 

wilh TUNER 

fiEQumeaiavAc $**95 

^TRANSFORMER AT 400 MA 

|nrtLM>u4*Cl] AM p (JULY 



Ail-FM 

STEREO 

TUNER 

$12.95 



TUNER ONLY 



FEATURE!: AM, FM Sl»r»a, 
Phone Input. Aui hpuL AC 
CMd, M0 Orwn An1*nru 



aur s urn 

[Tun*r Amp eotptwe) for 

$60.00 



I COD MINIMUM W-3.M * ADD HJ* FOR COO'i 

t U*S DtUVEAT AOOREU MUST ACCOMPAHT AU COD OfKhtH 

. 11.0& HAHOUMO. OH ORDERS UHDCR J1ft« 

i visa. HC CARD* Oft CHICK 

• ADD H. FOR SMPPWai 

• TCXAJ REHHHT1 ADO t\ STATE SALES TAX 

I ALL FOREkON OnDEAB ADD 2S* FOR IHlPPTHO (CANADA 1FA] 
HO FORE JEN COD'S 

• call (in) aramm to place criptt carp oh Cod phoer 



SEE SPECIAL FALL PRICES BELOW 

fpntCES good thuu DECEween at, rati} 

SHOP EARLY FOR CHRISTMAS 



\ Cpr Hortii 



Tha 

Suptr Ma*ic 

Maker 

revision : ' 

$24-95 

(Basic KM) 
Dc*l not rn-cr'utft tp**k*r 
SwilCfttt or 2706FQM. 

Now you can play hundreds of songs using Ihe Bullet Super 
Miwlc M«fcar. The unit fubjre* • single fectory 
progremmed mkroproceeecr IC that comes with 20 pre- 
programmed short tunes. Sy adding ihe additional PROMS 
(37oe's) the svtlem can be expanded to play up to 1000 
notes per PROM. Just Ihink ... a compact electronic 
Instrument that will play dozens, hundreds or even 
thousands of selections of music. The kH comes with eM 
electronic component* flees the PROM), end a drilled, 
plated and screened PC Board which measures 4" x 4%". 
The 7 watt ampullar seel Ion Is on the seme PC board end 
drives meohm speaker (not included), from a whisper to 
ear splitting volume. Since the unit works on 12 VDC or 12 
VAC , vehicle or portable operation is possible. What do 
you get for $24.9$? Everything but a speaker, transformer 
cbm, iwltchn, and PROM, Additional 2708 albums 
containing populsr tunes are avail able for $9.95 each or you 
can prog rem your own PROMS using information provided 
with the kit instructions. Lists of available PROM albums ere 
available on request, f Note/ unnpsays electron/emu* icone 
nofe af e timo. It is not poasibi* to play chords or a mofocV 
with hwmony sfmultantoLtaty.) 

* Envelope conlrol gives decay lo notes- 

* On board inverter allows single voltage (+12) operation. 

OPTIONAL ACCESSORIES 
DtP Switches (One 8 pes . One 5 pes i 2.0Q/Mt 

(Can be dtretfty soldered to PC Bd. lo access tunes) 
notary Switches Two 6 position 2.5oVaet 

(For remote wiring to PC Bd. to access tunes) 

Attractive Tan Plastic Case 650 

WadlpJufl Trans tormar 100 

(For operation on 11 TV AC house voltage) 

FALL SPECIALS: (Good Thru Dae '«l> 

1 Super Music M akar with case and two 5-poartipn rotary 
switches *32 do 

2 Super Muilc wrtri one 2716 2K X 8 PROM filled wilh 
ovafSp aeta^lona ot additional music ( iS00 notes) $32 00 

3. Th* Whota Bill of Wax' w2 * case end v*nch« $39 M 




CO 
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9 



126 



CIRCLE 41 ON FREE INFORMATION CARD 



WT-°n 

aiajt.ti 20 ib »t n 

*i*;tTi 22 ji jo i| 

AliS-r-T. is 21 u it, 

A20JT-1I J] 32 11 M 

«2JTti 3e IS W 33 

AJ4JT.TI 31 is Jfc 34 

AJSJT Tl 43 *3 41 40 

MMT-TI 4(1 *S #4 42 

Standard Soldart ail — TIN 

114 3Bu* Mjp lOth-a 

MT I » > » t 11 t 1) 

*HT 36 IS 34 33 

41 IT II 91 it 35 

JLJBT 44 43 42 41 

A22T T3 71 TO 41 

A24T *2 Si » 41 

fclll 71 Tt 7ft 7B 

J.?*" 13 II II 14 

MOT 10* I 0? iH "OS 

Standard Sordartail— Gold 



AUG 
422 G 
AUG 
42tG 
AHG 
A40£ 



00LD 



ah.v;i 

AiQwrl 

A14W0 

414WG. 

AIIWG 

A»W& 

«4WG 
AJSWG 

A 34 ftC 
A4QWG 



SOCKETS 



WIRE 
WRAP 
Level 3 



i» iJ3 131 




■ IS 


>*i i 


- 41 


142 1 


»3 


H2 f 


1 Bfi 


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AlttvT.Tl 

AJ9Wt-tl 

Ajiwr-n 
*j*y/r ti 

AJ1WT TI 
AMWT-Tl 
AA^VT-Ti 



* MICROPROCESSOR CRYSTALS * 



|Hht| 


.-;: 


- >, 


■K";r 


I'Mfui 


t * ',1 


KM 


i*a 


KB 


■ETTA 


XI M 


4 1147 


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CI1A 


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in 


1M4 


MLII 


CTil 


Mtn 


BeH 


CTJI 


I2f 


1 71*1 


HCII 


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KU 


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1M 


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HCII 


CUB 


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III 


(HI 


MCII 


mc 


CM 


Mill 


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IN 


Hqil 


G1IE 


L4H 


mi 


CMC 


■■t 


14 H 


HC11 


Hit* 


Uf 


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■ M 


14 Jill 1 


i-CII 


CTHA 



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•-■■■ caii nt i 

lit: EE1I Cfllfl 1 

I1CS HCII CT11A 

11 til HCII CTHB 

lllMI KC1I CTH4 

TIM HCII CYJ14 

H IM KCtl CY7JI 

17 H HCII CYM* 

JIM HCII CT1IA 

IHH i-.CII EY1HA 



PORTABLE THANDAR 

OSCILLOSCOPE 



Model SCI 10 
Only $369 



• LIGHT 
WEIGHT [2 Ibi, 

• AUTOMATIC CIRCUIT 
POWER DOWN FOR 
UNUSED SECTIONS 




• DC— 10MHi 

• 2" DIAGONAL CRT 

• SMALL SJZE 
( 1 0"x5.8*'it2"l 

• ULTRA LOW POWER 
CONSUMPTION 



6500 SERIES MICROPROCESSOR ICs 

A ={2 MHz) B=(3MHz] C=(4MHz) 



PG502A 
P6*»Q2fi 
PB5Q2C 

Pfl5o3 

PfJSOJA 

PQS04 

P8504A 

P6505 

P6505.A 

PSBOe 



S ft S3 

■9-M 
15 02 
2100 

sob 

BBS 
BOS 

8 82 

9 0S 
6 82 
BOS 



P«5MA 

P6S0? 
PB507A 

pfl&ia 

P6Si2A 

P6513 

PB513A 

P6514 

P0.514A 

P&S15 

PB520 



J8 g: 1 

113 

8.82 
B 8fl 
B 09 
BJU 

B,og 

BjH 

3 40 



P6520A 
P&S2D 
PB8B20 
P6521 

P6521A 

P6821 

F6B621 

PBB22 

F6522A, 

PflE 30-004 



J3 74 


3 40 


374 


4.90 


5.34 


4 go 


&34 


e 40 


11.24 


15.S4 



P653O-0OS 

PSS32A 

P&&4EM 
PS54&A-1 
P8551 
PS551A 

pe&si 

Pi 791-02 
PI 793-02 



S-TS.84 
1092 
11 87 
175T 
22 44 

10 71 

11 7fi 
40 0fl. 
•O.QQ 
4000 



swwsswwsssssss. 



nnnnrinna 



• 20% 
DISCOUNT 
COUPON 

Bring ihrs i'AH l*n\ anco one of our stores or 
mail to our Mail Order .addftss shown below 

and receive a 20% DIMUH M 
on purchnsos from ihis page of S50 00 or more 
Off, rK\P!KKSonl> mberl5. I**«l 

NAIUlf 
ADDRESS 

CITY STATt 

£lP PHONE NO 

Cou|.Kiii4 :ii.LfcLii*n ar*\y v*im lul> njm* *n r( *rl<JrtM iilldtt 




aasaaasaassa 




XR2J06KB FUNCTION GENERATOR KIT 
OPEBSIES DN EITHER 
Si N CLE 12 V ±EV SPLIT 5 IIP PIT I ' V 
INCLUDES ALL PARTS TO 

BE MOUNTED ON PC BOARD 



$19.95 



Da l T 
rtdli tutu* HOT IHCLVfllt 





POWER SUPPLY 

5 Volt 3 Amp 
APS 5-3 

1-9 S37.2E 

10 up .... 35.55 
25 up . 34.04 



LIQUID CRYSTAL DISPLAY 

• High Cwttnirt Ratio 

• Wide Viawlng Anglo 

• 0.5 in. Digit Height 
• ULTRA Low Power Consumption 
LCO106 $13,50 



WSB3 



• MEMORIES * 



STATIC RAM's 



2102-1 

2114L-2 

2114-3 

2114-2 

EPROM's 

2708 

2716 

2732 

DYNAMIC RAM 

4116 (200ns) 



(500ns) 
(200ns) 
(300ns) 
(200ns) 



(5 V) 
(350ns) 



1-9 
S 2.00 

3.50 
3.40 
3.50 

3.50 

6.50 

13.00 

3.00 



10 up 

; 1.80 

2.95 
2.80 
2.95 

3.30 
4.80 

11.00 

2.20 



100 up 

$1.10 
2.60 
2.50 

2.60 

3.10 

4.50 
9.90 

2.00 




CBM8032 
32K RAM 
» 80 Column Screen 

$1499.00 



EPROM 



2716-5 

(5 VOLT) 



$6.50 



EPROM Erasing Lamps 

• ERASES t CHIPS IN LESS IRAN 20 MINUTES 
■ SIMPLE TO USE • SAFETY INTERLOCK 

• ERASES 21UI. 2TIE. IJOIA. ■■. 
UVS-I1E SIS.00 



□ 



30 MHz 
HITACHI 



'-_ . DUAL TRACE 

— » PDRTAELE OSCILLOSCOPE 



B;PRA0 $1.S1 


BfR9i 


242 


CA3054 


1.54 


CA30&9 


3 34 


CA»79 


2TS 


DAcoacf 


3 43 


MflDld 


7J 


MBD102 


BS 


MSD201 


103 


MB 0501 


1.57 


MC78L0SCP 


.60 


MC7ei08CP 


.Bfi 


MC78LT2CP 


■;;■ 


MC78Lt5CP 


■■':■ 


MC7BLIBCP 


„G£ 


MCTSL24CP 


.Bfi 


MC78MG5C1 


1.47 


vc7EVMc:r 


1.47 


WCJflMOeCT 


i 47 


MC7BHUCT 


1 •!■ 


MC7IM15CT 


1 ^T 


MC7BMI9CT 


1 47 


MC7BM20CT 


1 47 


MC7BW24CT 


1.47 


MC73L05C"iP 


1.12 


MC7BL1 2CP 


1 12 


MC79U&CP 


1.12 


MC7SL?4CP 


n: 


MC6*4P 


3-20 


MCBSOP 


2 05 


MC884P 


6,10 


MC8ML 


2.27 


wca:sL 


24» 


MC839L 


5B* 


MC&J9L 


3.17 


h4C847L 


2 4& 


UC8S7P 


1.50 



MC85BP 

MCSB2L 

MC9&SL 

«CI302P 

MC1309P 

MC1310P 



1 1 SO 
2,27 
4.43 
3,72 

2SE 
6.29 



ME133OAIP220 



MGtSASP 
MC1350P 

MClStrIP 

MCI 352 P 

MCI 387 P 
MCI3&eP 
MCI3B4P 
MC1372P 
MCJ373P 
MCi 33 IP 
MC1403UQ 4,08 
MC140SL itIB 
MC1408Le 3.S4 
MC1408LT 4.75 
MC140SL8 «&B 
HC140HPB 4.4Q 
MC14T3P 1.88 
MC1430CU 4.96 
MC1437L 
:.i. i-;.;'<i 
MCT439PI 
MCI 44 5 G 4 20 
MC14&EP1 ,99 
MCI J5SUD5 I LIB 
MC14SBCL 1.44 
MCI45BCP1 1.0? 
MC14&8P1 1.08 
MC1458P1S 133 
MCI4B8L I 00 



1,72 
1.44 
2.10 
2.01 
2.10 
2.1ft 
1.91 
2.01 
6.48 
519 
1.44 



a.9fi 
4.62 
3.B7 



MC14B 


w 


il.47 


MC14I 


SAL 


1 69 


MC14B3L 


i ea 


UC1489P 


1.47 


MCI4S1L 


6 53 


UC149&L 


7,47 


MC149&G 


2.07 


MC186BR 


13.42 


MCI 594 L 


12.74 


MC1595L. 


10.63 


MC1710CP 


S9 


MCI 733CP 


130 


MCI 776CP1 


2.07 


MCSSQ7P 


I3B 


MClSQBP 


1.38 


MC1609P 


1.36 


MC3062L 


4.0O 


MC3302P 


1,11 


MC3303P 


5 60 


MC332&P 


2 10 


MC3340P 


2 10 


MC33B0P 


3.50 


MC3370P 


3.72 


MC3403P 


1 77 


MC3405P 


3.60 


MC340BL 


3.5* 


MC3410L 


31 42 


MC3417L 


1*.fl3 


MC3420L 


lD.oa 


MC3423PT 


1.88 


MC3438L 


4.33 


MC 344 HAP 


540 


MC3470P 


12 84 


MC347BPI 


318 


ML 34 SOP 


12.BE 


MC35Q3L. 


16 42 


MC4C 


8f 


;o 10 



ANCRONA 

MC4024P 
MC4Q28P 

MC4044P 
MC4558NCPI 

McaaoOP 

MCfiAOSP 
MCW09P 
MC«a2lP 
MC8S40P 

MCW44P 

Mcaa48P 

MCBB4BP! 
MC5B4JP 
MC8J50L 
MCBBSOP 
MC8B82P 
MC6B54P 
UCftBBOP 
MC6675L 

Mcesaip 

MC68S2AL 
MC68H5P 

Mcesaap 

MC6867P 

MCB888P 

MCS899P 

MC703-5Cr 

MC780BCT 

MC79I2CK 

MC7«I2CT 

MC781 5CK 

MC7815CT 

MC7B1 BCT 

MC7B24CK 

MCM02CT 

MC7905CT 

MC7&06O, 



HAS MOTOROLA SEMICONDUCTORS 

SB. JS 

3.05 

fi.75 



3.11 

13.30 

13. BO 

*5 39 

7.33 

12.22 

4&3fl 

41.20 

39 SO 

lBDB 

14.32 

6.64 

7.33 

32.25 

12.92 

13 49 

B91 

8 13 

2.71 

2.72 

272 

2.72 



t.65 
3 14 
165 
3 14 
165 
1.65 
3 !4 
2 10 
2.10 



MC79O80T 
MC790BCT 

MC7ftl2CT 

MC791ECT 

MC7316C-i 

MCTB24CT 

MCI0101P 

MG10102P 

MCI 01 CMP 

MC1O107P 

MC10109P 

MC101 15P 

MC10116L 

MC10H6P 

MC10123L 

MC10124L 

MC10124P 

MC1012BL 

MC10125P 

MCI 01371. 

MC10176P 

MC1GIS9L 

MC101S5L 

MCI 02 161 

MC14411P 

MC14412VP 

MC14435VP 

MCI 4457 P 

MCH45BP 

MC14490FP 

MC144BOVP 

MC 14455 P- 

MC34004P 

MC684B5P 

MCA2S8 1 78 

MCM88A10P 5.59 

MCM6566L25 46 40 



12 10 
2.10 
2 10 
2.10 
2.10 
2 10 



100 



1 10 
.92 

2-39 
3.01 

2 52 
3.01 
252 

32.36 
6 26 
327 
2S2 
183 

17.26 

15 53 
664 
8 60 

13-73 
5.60 
4.24 
396 

3 62 
32 35 



MCM6A74P 
MCM8BI0C 

MCP.10J 

MCR106-2 

MCP33ia-fl. 

MDA100A 

MDA101A 

M0A102A 

MOA104A 

MDA106A 

MDA108A 

MOA110A 

MOA200A 

MDA201A 

MOA202 

MJE3055T 

MPT 101 

MPN3402 

MPS91S 

MPS3636A 

MPS370* 

Mf5$514 

MPS6520 

MPS6521 

MP56522 

MPSS523 

MPS6SS6 

MPS8099 

MPSa6S9 

MPSA06 

MPSA12 

MPSA13 

MPSA20 

MP$A42 

MPSA58 

MPSA64 

MPS* 70 



111 17 
7.47 



.79 

l 01 
7.74 
2.05 
2-21 
2.38 
2.54 
2.63 
3.31 
360 
2.21 
2.3B 
2.64 
1.29 
65 
.78 



MP6H34 I 

MPSU03 

MPSUD5 

MPSU06 

MPSulO 

MPSU51A 

MPSU54 

MPU13T 

MPt2S0-2 

MP750 

MR7S1 

MR752 

MR764 

MR756 

Mft7&8 

MR 700 

MRBI2 

MRF476 

MHF901 

MRFflll 

MV209 

MV839 

MV2115 

MV2206 

MV2209 

HE592N 

SC136B 

SCI 360 

SC141B 

SC141D 

T28O08 

TIL116 

T1P102 

TlPllO 



112 
1.28 

2 n> 
Z 55 
3.21 

-51 
IBS 

3 IB 
104 
1 13 
2.42 
S 27 



R 



MODEL 
V-302B 



IB9&.00 

More sensitive to your input 



Universal Osc illoscope 
Probe 




h- ■ $ 36 



00 



SWITCH ABLE XI and XI AUenuation Factor 

KEY ADDITIONAL FEATURES: * limMM/ Jv .*.■■■• • H«ivy 

■ : ' . tip • i'.i .- ,■..!.... miifT opndutioi • --!.•.:■ nr^Lti|>< ■at<I*' 

• bll . |l... I. m..'|i • Wldr . iiin!.|-i.viln,n I >M f> • }l- .ill '.I'l-.ir-. 

• Untupid irlrrrmr itn hr d'livdErd! ai h|j • Itn hidw SPHl^Nti 
rfOUW LC TIP. BN<_ AUAPTI1H. INbULATING TIH-ud TKIMHE.K 
TfM>l ACCLbSOHILb 



MARK IV LED POWER LEVEL INDICATOR 
I • Display flange -360B ;o-*-5d3 

• FJoitina or Gradual Ouipui Indicating 
| * Kit includes transistors, Ifids. capjci- 
tors, resislofs, PC Board, and siJk 
EcrBaned metal Troni pan pi 



19 pn 

KIT $31 .50 




STOW S DO NQT ACtl PT MU DRH B$ 

MAILORDER 

OX 2208R CULVER CITY, CA90230 



PHONfc ORDERS 1213) 641-4064 



■ OntallDH mi 7 00 Utm* m*m ** M^l-( UiiWChtfll 
A mi K tr * 4 t flHM tk4* rtw A*ft lW m ^ i Hils ^ w«j >Ml 
m Mb hM 4*1 IH Mbpd <• pn« |A K| p us in HH * irftl 

a*t *•» *i *■■ M* 1 Oftn |K*i Wi man tiw nhi i> - ■*-" — 



MOTOROLA'S OPTO TRIAC 
DRIVER COUPLER^ 



Tff- 
MOC3Q09 

MOC3Q1D 
MOC3011 
MOCJ020 
MOC3021 
MOC3030* 

Mocaoar 

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260 
250 
400 
400 

260 
250 



271 

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3 15 
3.52 



Z-80 SERIES 



2 5 MHz 
z-so-ceu $ 7.io 

Z-80-CTC 

z-Ba-pio 

Z-BO-DART 

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Z-B0-S1Q/S 
ZBD-OMA 



5 50 
1430 
20. lO 
14.50 

21 50 



4.0 MHz 

I-eOA-CPU $ 80S 

Z-MA-CTC 

;-80A-F10 

Z-aOA-DAdT 

Z-SOA.S1O/0 

Z.BOA-S10/9 

Z-SOA-DMA 




3Vi- Digit. LCD- Display 
DIGITAL MULTIMETER 

HANDY — «Aiy te held, to cany- to us*. to 
ACC URATE — t»K 0. 1% DC aaaUntey - 

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traniiftor #lk>N™ b.lt^ ■ EXPANDABLE - 
ui« n»nd«fd DMM Attaitjonas 10 axtand mnqts 
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MODEL 935 St 75 00 



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ATLANTA 

3330 Piedmont Ftd. N.E. 

Atlanta. GA 30305 

(404) 2BI-710O 



CULVER CITY 

1 1080 Jefferson Blvd. 

Culver City. CA 90230 

(213) 390-3595 



HOUSTON 

2643 Richmond 

Houston, TX 77098 

(713| 529 3469 



PORTLAND 

1125 N.E. 82nd Ave. 

Portland, OR 37220 

(S03| 254-5641 



SANTA ANA 

1300 E. Edinger Ave. 

Sant3 Ana, CA 32705 

(714) 517-8424 



SUNNYVALE 

1054 E. El Camino Real 

Sunnyvale, CA 94087 

(40S) 243-4121 



TUCSON 

451 8 E Broadway 

Tucson, AZ 8571 1 

1002) 8B 1-2348 



CIRCLE 73 ON FREE INFORMATION CARD 



127 



LOW TIM DC STEREO 
PRE -AMP KIT TA-1D 20 

Incorporates brand -new D.C design that gives a freq uency 
response from OHz-lOOKH: ± O.SdB! Added features 
like tone defeat and loudness control lei you tailor your 
own frequency supplies to eliminate power fluctuation! 
Specifications: • T.H.D. less than .005% » T.I.M. less 
than .005* • Frequency response: DC to lOOKHi ± 
0.5dB • R1AA deviation: ± 0,2dB • S/N ratio: better 
than 70dB • Sensitivity: Phono 2MV47K/Aux. 100MV 
100K • Output level: 1,3V • Maxoulput: 15V • Tone 
control: bass ± lOdB @ 50Hz/treble± lOdB ® 15Hz • 
Power supply: ± 24 D.C. @ 0.5A 

Kit comes with regulated power supply, all you need is a 
48V C.T. transformer ffl 0.5 A 

ONLY $44.50 

X'former 

$4,50 ea. 



100W CLASS A POWER AMP KIT 

Dynamic Bias Class "A" circuit design makes this unit 
unique In its clajj. Crystal dear, 100 watts power output 
will satisfy the most picky fans. A perfect combination with 
the TA-1020 low T.I.M. stereo pie-amp 
Specifications^ 

• Output power: 1O0W RMS into 8 -ohm 
125W RMS Into 4*ohm 

• Frequency response: 10Hz-100KHz 

• THD : less than 0.00396 

• S/N ratio: better than 80dB 

• Input sensitivity: IV max, 

• Power supply: ± 40V ® 5 amp 

• One channel, needs two Eqt stereo 

TA-1OO0KJT 

$51.95 

Power 

transformer 

$24.00 each 



SO WATTS AUTO STEREO BOOSTER 
BY VERTRONIX 

Specifications:* 50 watts RM S total |25W + 
25W) 

• Frequency Response: ± 
O.E-dB, 20Hi~20KHi 

• T.H.D.: 0.2% at full rated 
output 

• Input Impedance: 20K ohms 

• Crosstalk: Better than 90dB 

• Sensitivity: 1.5V for full 
rated output 

• S/N Rata Greater than 95dB 

• Speaker Load: 2- v 8 ohms 

• Voitage Supply: 9"- 18V D.C 



Model V- Amp 500 

REG, PRICE 

$119.00 EACH 

OUR SreOALPRICE 

155.00 EACH 



"FISHER" 30 WATT STEREO AMP 
Mt*. Mti. MAIN AMP (15W x 2} 

gttflk Kit includes 2 pes. Fisher PA 301 

Wf H f Hybrid IC all electronic parts with PC 

JSf jB5P E -° ard Po,A ' er su pp 1 v ± 16U rjc 1"°' 

' " " Included). Power band with (KF 1 % ± 

Super Buy 3dB). Voltage gain 33dB, 2QHz-20KHz. 
Only SI 8. 50 



5W AUDIO AMP KIT 

2 LM 380 with Volume Control 
Power Supply 6 18V DC 
ONLY 

$6.00 EACH 



2 WATT AUDIO AMP 

Pre assembled units. All you need Ls to hook up the 
speaker and the volume control. Supply voltage from 9*" 
15V D.C measures only 2" x 3W\ making It good for 
portable ordtscrete 

applications. Comes 
with hook up data. 

BUY 2 FOR 
$4,99 



I WATT AUDIO AMP 

All parts are pre -assembled on a mini PC 
Board, Supply Voltage 6**9V D.C 

SPECIAL PRICE $195 m? 



NEW MARK III 
9 Steps 4 Colon 

LED VU 

Stereo level Indicator kit with arc-shape display panel!]! 
This Mark I II LED leve I ind icator is a new design PC board 
with an arc-shape 4 colors LED display (change color from 
red h ye Bow. green and the peak outpu t in d Seated by ros e). 
The power range is very large from — 30dB to +5dB. The 
Mark III Indicator is applicable to 1 watt* 200 watts 
a mp lifi er operating voltage Is 3 V-9 V DC at max 400 MA . 
The circuit uses 10 LEDs per channel. It Is very easy to 
connect to the amplifier. Just hook up with (he speaker 
output! 

IN KIT FORM $18.50 



MARK IV 15 STEPS LED 
POWER LEVEL INDICATOR KIT 

This new stereo level Indicator kit consists of 36 4-cotor 
LED (15 per channel) to Indicate the sound level output of 
your amplifier from — 36dB +3dB. Comes with a well- 
designed silk screen printed plastic panel and has a 
selector switch to allow floating or gradual output indicating. 
Power supply is 6 12V DC with TUG on board Input 
sensitivity controls. This unit can work with any amplifier 
from 1W to 200 W! 

Kit Includes 70 pes. driver transistors. 38 pes. matched 4- 
color LED, all other electronic components. PC board and 
front panel. 

MARK IV KIT 

$31.50 



MARK V 15 STEPS LED 
POWER OUTPUT INDICATOR KIT 

All functions same as Mark IV but this is with 
heavy duty aluminum front plate and case. 
Can be easily slot into the front panel of your 
auto, truck or boat. Operates on 12V DC 



.............. 



$41.50 EACH KIT 



SOLID STATE STEREO GRAPHIC 
EQUALIZER PRE AMP KIT TA-2500 

Specifications: 

• Total Harmonic Distortion: Less than 0.05& 

• Intemvodulation Distortion: (70Hi:7KHz = 4:1SMFTE 
Methodl Less than 0.03% 

• Frequency Response: Overall lOHi r*r lOOKHz 
+Q,5dB, -IdB. 

• R1AA Curve Deviation: (Phono) +0,2dB. -0.2dB 
i30H!'-15KHi) 

• Channel separation [at rated output IKHz) 

• Phono. Tuner, Aux andTape Monitor betterthan 70dB. 

• Input sensitivity and imped ance (1 KHe for rated ou tpu I) 
Phono: 2MV 47K ohms Aux: 1 30MV 50K ohms 
Tuner. 130MV 50K ohms Tape: 130MV 50K ohms 
Graphic Equalizer control: 10 Band Slide Control 
Frequency Bands: 31 .5Hi;G3Hz: 125Hz: 250Hi; 500Hz; 
LKHi; 2 KHz; 4 KHz; SKHi: l&KHi also with on panel 
selector for Phono. Tuner, Aux 1 and Aux 2. 

Power Supply: 117 VAC 

Kit comes with all electronic components, transformer, 

instructions and a 19" rack mount type metal cabinet. 



MODEL TA-2500 
$119.00 PER KIT 



ELECTRONIC DUAL 
SPEAKER PROTECTOR 

Curt of! when circuit Ls shorted 
or over Load to proteci your 
amplifier as well as your speak- 
ers. A must for OCL circuits. 

KIT FORM $8,75 EA. 



PROFESSIONAL REGULATED VARIABLE 
D.C. POWER SUPPLY KIT 

All solid state circuitry with high efficiency power transistor 
2SD388 and I.C. voltage regulator MC1733 Output 
voltage can be adjusted from 0-30V at 1 amp current 
limited or 0-15V at 2 amp current limited. Internal 
resistance is less than 0.00b ohm; ripple and noise less 
than 1 MV, dual on panel meter for voltage and amp 
reading, also with on board LED and audible over load 
indicator. Kit comes with predrilled P,C. board , Inslructtons, 
all necessary electronic components, transformer and a 
professional look metal cabinet. The best project for 
school and the most useful Instrument for repairman. 
Build one today! 

MODEL TR SSA - 15V D.C. 2 amp 
MODEL TR3SB0~ 30V DC 1 amp 





■ . ; -•-- • MM 


*J *rj 



$59.50 PER KIT 



REGULATED DUAL VOLTAGE 
SUPPLY KIT 

± l~ 30V DC 800 MA adjustable, fully regulated by 

Fairchild 78MG and 79MG voltage regulator I.C. Kit 

Includes all electronic parts, 

lllter capacitors, E,G, heat 

sinks and P-C board. 



'■i^pc*** m * 



$12.50 PER KIT 



POWER SUPPLY KIT 

0-30 V D.C. REGULATED 
Uses UA723 and ZN30S5 Power TR 
output can be adjusted from Q-3QV, 2 
AMP. Complete with PC board and all 
electronic parts. Tranformer for Power 
Supply. 2 AMP 24V x 2 S9.50 



0-30 Power Supply 

$10.50 each 



AUDIO OUTPUT dB METER 



i 



-2K" 



Meter made of clear plastic 
with a silver white face 
plate. Scale reads from 
-20 +3dB. Meier also 
comes with an internal 
dial light. 



MODEL: GF-3 

$6.50 EACH 



^% FORMULA INTERNATIONAL INC. 

Ci..*S F 1 ._...J^ftr*'WS»Wti»(!!r«l>_..._ I Sen 



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tnA«S»lfcra»IEMgi~ 



11/81 



Send 51 .00 
For Detailed 
Catalogue 



12603 CRENSHAW BLVD.. HAWTHORNE. CA 90250 
PHONE: (213)973-1921 • (213) 679-5162 



TWO IN ONE PANEL METER D.C. VOLTAGE 
AND AMP IN ONE 



D.C. Volts reads 0-50 
D.C. Amp reads 0-3 
Meter case made of black plas- 1 
tic with a white scale plate and I 
glass window. 



»sr-6S0 $12.50 EA. 



POCKET STEREO CASSETTE PLAYER 
WITH STEREO HEAD PHONE 

This unit is a high 
fidelity stereo player 
which will give you 
years of Listening plea- 
sure and follow you 
wherever you go. 
Made by the same 
company in Japan 
who use the "Big, 
Name." 

Complete set comes 
with 1 Stereo head- 
phone< 3 AA size al- 
kaline batteries, I 
Leather like carrying 
case for player and 1 
carrying case for stor- 
age of 4 cassette tapes 
and 1 demo tape. 



MODEL SWM-33 

OUR DIRECT IMPORT PRICE 



$67.50 



CIRCLE 7 ON FREE INFORMATION CARD 









FOR COMMERCIAL FREE 


TV BOX BUILDERS 


__^J MC1358 52.50 LM7815 $1.20 




1 MC 1350 J2.00 NE 565 $2.00 




1 MC 1330 $3,00 Connector! Set $1.00 




1 LM 145S $1.00 I.C. Socket Set $2.00 




1 LM 380 $2.00 Matching Transformers 1.40 




1 Sanyo UHF Tuner $35.00 Tolrlod Colls 




1 Capacitors Set $12.50 (Set oi 4) $3.00 




1 Resistors Set $200 Speaker Cabinet $12.95 




1 Trim Pots: Transformer 




Trim Caps Set $13.50 1SV 800MA $3.00 




1 Pots and Knobs $2.00 



We sell you oil the above componenis In a package for 
$1 25.00 And you will receive a free prednllcd PC- board 

and ins [ructions at no charyc 1 



SANYO UHF VARACTOR TUNER 

For UHF CH 14 83 
Tuning voltage +1V"+28V D.C. Input impedance 75 
OHM LF. band width 7 W6 MHi. Noise figure 1 1 5d B 
MAX. Size 2H" ic 114" x H". Supply voltage 15V D.C. 

Sound I.F. - 58.0 MHi. 

Video IF. = 62.5 MHz. 

All units are brand new 
from Sanyo. 
MODEL 115-B-405A 

$35.00 EACH 

Tuner is the most Important part for the circuit. Don't let 
those $19.00 tuners fool you! 




TV GAME BOARD 

PLAYS 4 GAMES TENNIS, HOCKEY; HANDBALL 
AND JAI-ALAI. 
All boards complete with all parte ready to play. Requires 
6C size batteries and a small speaker for sound effects. 
The boards were Surplus from a famous game manufac- 
turer. They will piny on ail US standard black and white or 
color TV sets. (Regular price for these games were S 39-50 
each) OUR PRICE ONLY $6,50 EACH 



TENNIS 



JAI-ALAI 




PART '57456 



HOCKEY HANDBALL 



ELECTRONIC PIN BALL MACHINE 



That sounds and plays like the 
real thing. All units are brand 
new but without the case. Func- 
tions of the game include 
double flipper control, kicker 
controls 1*4 players. 3 speed 
ball control, tilt switch, auto- 
matic score, extra bonus cave 
and ma ny more . All sol Id state 
with LED paneE. no moving 
parts. Requires 9V battery to 
operate, speaker not included 



A perfect gift for yourself or friends 
SPECIAL$8.99 EACH 5PEAKEE$1.25 EACH 




ELECTRONIC MUSICAL TELEPHONE 
REST KIT 

This telephone rest can be used as a door charm, an 
audible indicator and for many other sound projects. The 
special custom made l.C Is pre programmed with 4 
musical tunes. Kit comes with a nice looking piastre case, 
pre-drilled P.C board, volume control, special sound l.C. 
speakers and all electronic components and Instructions. 
Ideal for home or school projects. 



BUY 
NOW! 




SPECIAL 
PRICE! 
ONLY 

$15.50 PER KIT 



MODEL FIH-3000 



LCD CLOCK MODULE! 

• 0.5" LCD 4 digits display • X'tal control led circuits • 
D.C. powered 1 1 ,5V battery) • 12 hr or 24 hr. display • 
24 hr. alarm set • 60 mln, countdown timer • Onboard 

dual back-up lights * Dual time zone display • Stop 
watch function 

NIC1200 (12 hi) 
NIC2400 (24 hr) 

ON SALE 

$16.99 EACH 




0.5" LED 
ALARM CLOCK MODULE 

Assembled! Not a Kit! 

Features: • 4 digits 0.5" LED Displays #12 hours real 
time format • 24 hours alarm audio output • 59 mln. 
countdown timer • 10 min. snooze control. 

ONLY $7.00 EACH 
SPECIAL TRANSFORMER 
FOR CLOCK 

$2.50 




DIGITAL TIMER/CLOCK 

• 24 Hour preset time to turn on or off 
4 12 Hour green 0.5" display tor time 

• operated on 12" 16V AC 

The whole timer Is self 
contained in a compact 
plastic case (as seen In 
photo). Designed for VTH 
with push button switch 
for easy setting. Limited 
quantity available. 

MODEL VEQ 0143 

SPECIAL! NOW ONLY $12.94 




MATCHED PAIR POWER TRANSISTORS 

BY MOTOROLA 



<** 



M J 2955 PNP 
2N3055 NPN 



150 Walls 



BV-60 V $3.50 

I-C. = 15A per pair 



«*.**, MJE2955PNPon.u, „< BV=60V $3.00 
MJE3055NPN LC-IQA per pair 

fe fw MJ15003NPN 2 , OW BV-140V $12.00 
N| ^ MJ15004 PNP' 1130 wons I.C.=20 A per pair 

All above parts guaranteed to be prime and come with 
data sheets. 



MUFFIN FANS FOR EQUIPMENT COOLING 

Th C5 e fans are pu tied out from 
used computers. But carefully 
cleaned by ultrasonic cleaner. 
All In "like-new" condition. 
Size 4 11/16" it 1-1/2" x 
4 11/16" 
MODEL MF505 
$9.50 EACH 



FLUORESCENT LIGHT DRIVER KIT 

12V DC POWERED 
Lights up 3 ^ 1 5 Watt Fluo- 
rescent Light Tubes. Ideal 
for camper, outdoor, auto 
or boat. Kit includes high 
voltage coil, power transistor, 
heal sink, all other electronic 
parts and PC Board, Ikjht 
$6.50 Per Kit tube not Included! 



PRESS-A-LIGHT SELF 
GENERATED FLASHLIGHT 

Never worry about battery, EXCLUSIVE! $3 .9 5 C«, 

because it has none 1 Easy to 

carry In pocket and handy to 

use. Ideal for emergency light. 

It generates ils own electricity 

by squeezing grip lever. Put 

one in your car, boat, camper 

or home- You may need it 

some time! i— ^ 



Model F-179 



£ 



No FCC license 

required. 
OUR PRICE 

$49.50 

ADDITIONAL 
MICROPHONE 

(TRANSMITTER) 
AVAILABLE 

AT $28.00 EACH 



CRYSTAL 
CONTROLLED 
WIRELESS 
MICROPHONE 
SYSTEM 
Transmitter: FET mic for flat 30 
**r\& KHz response extra con- 
trolled 49MHz AM Band fordrift- 
Eree performance. 100 MW 
output {range approx. 14 mile) 
for reliable long range 
transmission. Powered by 
a 9V radio battery (In- 
eluded J, 

Receiver Extra controlled 
locks on 49MHz trans- 
mitter signal. 
With on panel 
VU meter 

monitors the signal strength from the microphone. Stan- 
dard phone Jack outlet connectio n to a PA . or other phone 
input, 9 V battery Included . This professional set is ideal for 
on stage, in field, church, in house or outdoor use. 




MURA WMS-49 



SUPER FM WIRELESS MIC KIT- 
MARK HE 

This new designed circuit uses high 
FEQ. FET transistors, with 2 stages 
pre amp. Transmits FM Range (88- 
120 MHz) up to 2 blocks away and 
with the ultra sensitive condensor 
microphone that comes with the 
-5J;_**^ kit, allows you to pick up an y sou nd 

within 15 ft. awayl Kit includes all 
electronic parts. OSC colls, and 
P.C. Board. Power supply 9V D.C 

fmc-105 $11.50 PER KIT 



Jjp 



WEM-36 FM WIRELESS MICROPHONE 

TEET MODEL WEM-36 Is a factory assembled FM 
wireless microphone powered by two AA size ball erics. 
Transmits in the range of 88-108 MHi with 3 transistor 
circuits to meet with F.C.C. part 1 5 regu tatio ns . El em ant is 
built in a plastic tube type case with an omnl-directional 
electret condenser microphone unit. By using a standard 
FM radio, signal can be heard anywhere on a one-acre lot. 
Sound quality was judged "Very good. 



MODEL WEM-36 



$16.50 EACH 



WHISTLE ACTIVATED SWITCH BOARD 

All boards are pre -assembled and tested. Your whistle to 
Its FET condenser microphone from a distance, as far as 
30 feet away (sensitivity can be easily adjusted) will tum 
the switch on. then m tf.cn your whistle to it again, then it 
turns off Ideal for remote control toys, electrical appliance 
such as lights, coffee pots, TV, Hi-Fi, radio or other 
projects. Unit works on 9V DC 



MODEL 968 

$4.50 EACH 




1& 



ULTRASONIC 
SWITCH KIT 



Kit includes the Ultra Sonic Transducers. 2 PC Boards for 
transmitter and receiver. All electronic parts and Instruc- 
tions. Easy to build and a lot of uses sue has remote control 
for TV. garage door, alarm system or counter. Unit 
operates by 9-12 DC. $15.50 



ELECTRONIC SWITCH KIT 



CONDENSER TYPE 

Touch On Touch Of! 

uses 7473 l.C. and 

12 V relay 



$5.50 each 




^% FORMULA INTERNATIONAL INC. 



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11/81 

Sand $1.00 

For Detailed 
Catalogue 



1 ?603 CRENSHAW BLVD.. HAWTHORNE. CA 90250 
PHONE: (213) 973-1921 • (213) 679-5162 



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3*3K. ■■? ii«;4Vf: B0 
MOT ^ D J 12. 

15. IS or 24V t K 
LAS14I3- I2V3A*3K 



POSTAGE ADD 10% FOR ORDERS UNDER 5 20 00 
RATES ADD 5ft FOR ORDERS BETWEEN 1-20.00 AND tEO.OO 

ADD 3% FOR ORDERS ABOVE 450.00 



Tf PUS «* CAMEiniO^. Ja*S5 SI*ID CHICK 
OR MONEY OPOEft MlNIVuM 7"ElEPmC*I( 

coo PuncNiuE oudch an cmarci uooa 

MihlMLfM MAIL ORDER *S 05 



S*NO 1 » FO#L OUft CATW.00 
FEATURING TRAHSlHTOPS h 

wcTraiu 14H hamps-hiiu 

ir LAMB,HJD-rjE MA5S VHM 



SOLID STATE SALES 

P.O. BOX 74D 

SOMERVILLE, MASS. 02143 

TOLL FREE NO. - FOR ORDERS ONLY 



TEL (617)547 7053 

WE SHIP OVER OVER 95% 

OF OUR ORDERS WITHIN 

24 HOURS OF RECEIPT 

TOLL FREE 1-800- 343- 5230 



CIRCLE 71 ON FREE INFORMATION CARD 



2 

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£ 

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to 

00 



131 



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N'T ^ VI 

BLAME ^^\ 
THE ^F 

SOFTWARE! \ 

Pat, *A,259,705 

Power Line Spikes and Hash often cause 
memory loss or erratic operation. Often 
floppies, printer & processor interact! 

OUR patented ISOLATORS eliminate 
equipment interaction AND curb damag- 
ing Power Line Spikes, Surges and Hash, 

Filtered 3-prong sockets and integral 
Spike Suppression. 125 VAC, 15 Amp, 
1875 W Total ■ 1 KW per socket, 

ISO-1 ISOLATOR. 3 Filtered Sockets; 
1000 Amp 8/20 usee Spike Sup- 
pressor $62.95 

ISO-4 ISOLATOR. 6 Filtered Sockets; 
1000 Amp 8/20 usee Spike Sup- 
pressor $106.95 

ISO-3 SUPER-ISOLATOR 3 DUAL fil- 
tered Sockets; 2000 Amp 8/20 usee 
Spike Suppressor $94.95 

ISO-7 SUPER-ISOLATOR. 5 DUAL fil- 
tered Sockets; 2000 Amp 8/20 usee 

Spike Suppressor $154.95 

Miitor-Chtrga. Visa, American Express 

TOLL FREE ORDER DESK 1-800-225-4676 

lucapi AK, HI, MA. Pfl & Cantdt) 



Electronic Specialists, Inc. 

171 Soulfi Main Street. Malic*. MA 01760 
Technical & Non BOOl 1-61 7-655- 153 2 



CIRCLE 20 ON FREE INFORMATION CARD 



ELECTRONIC KITS FROM HAL-TRONIX 
2304 MHZ dowh converters, tomes in on 

CHANNELS 2 TO 7 ON YOOR OWN HOME T.V 
HAS FREQUENCY RANGE FROM £000 MHZ TO 
2500 MHZ. EASY TO CONSTRUCT AND COMES 
COMPLETE WITH ALL PARTS INCLUDING A 
DIE-CAST ALUM CASE AND COAX FITTINGS 
REQUIRE A VARIABLE POWER SUPPLY AND 
ANTENNA t Antenna, can be a disb type 
or coffee can type depending on the 
signal strength In your area. ) 
2304 MOD 1 (Basic Kit) $49.95 

2304 MOD 2 (Basic / Pre-amp) $59.95 

2304 MOD 3 (Hl-Gain Pre-amp) $69.95 

pow^r supplyVoreither model above is 
available comes complete with all parts 
case. transformer. antenna switch and 

CONNECTORS (Kit) S24.95 

Assembled $34 95 

Slotted Microwave Antenna For Above 

Downverters „ $39.95 

PREAMPLIFIERS 
HAL PA-19 — l.Smhito lSOmhi. 19db gain operates 
on B to 18 volts at lOma. Complete unit JS.95. 
HAL PA-1.4 — a mta to 1.4 ghz. lOto 12 do gain oper- 
ates on 8 to IS volts at lOma. Complete unit $12.95. 

(The above units are ideal for receivers, counters, etc 1 
16 LINE Touch tone decoder kit "UH 

P.C. BOARD AND PARTS $69,95 

12 LINE Touch tone decoder kit with 

P.C- BOARD AND PARTS , $39.95 

16 LINE Encoder kit, complete with 

CASE/ PAD AND COMPONENTS ....539,95 

12 LINE Encoder kit, complete with 

CASE, PAD AND COMPONENTS .,.,$29.95 

MANY, MANY OTHER KITS AVAILABLE 

l*rtd .S( UUmp or i.A.i.E. lor Iftf amotion W f I >•< on Mh#f 

HAL^TKOMX praducit. To ^6*' by phon*, tOt3-?fl5°17M. 



& 



MflWIHG 
IHfOftMATKW, 



Hal-Tronix 

P.O. Box 1101 

Sotithggit. Ml 46195 



OUHftj QvtM»K vUMlWHDMIMeiKin 

O mm *t*m Ac« TK>lA Lot*i.«i jjtr MQmmE' 

C* CMf 1} UH THAW 1JG UHUH HtlUW ABWTKH*. 
AL 1 I SO FC* HAXH hi iNO MABJH CH* P.O| 1 



CIRCLE 21 ON FREE INFORMATION CARD 



SAVE $$ ON A LUXURY CLOCK CLOSEOUT 

National Semiconductor's MA10Q3 is the Cadillac (or Mercedes, it you prefer) ot clock 
modules. Designed for installation in cars, boats, and recreational vehicles, the MA1003 
has four blue-green fluorescent digits that are lar more pleasing to the eye (and more 
readable) than either LEDs or LCDs. A built-in crystal timebase ntaintains accuracy to 
0.01%, and wiring it up couldn't he simpler; Just add 12V DC and two time-setting 
switches. 

Whether for yourself or for giving as a gitt, until now you had to pay quite a tot for this 
classy clock module. , .but we're changing all that. For a limited time, you may buy TWO 
brand new MA1003 modules tor S19.9S (aingle modules are S10.95). 

Looking lor a great-looking clock? Then this is the deal you've been wailing for. Hurry, 
though; quantities are limited. 




132 



SOLDERTAIL SOCKETS 

Buy in quantity and ami Everybody needs 
I sockets, and at these low prices, there's no better 
I time to stock up iharn right now. S pin 100/4S.95; 

1 14, 16 * 18 pi* 50/S4,95; 20 pin 40/W.95; 24, 28 
| pin 30/*4.9S; 40 pin 20/54,95. 

POWER SUPPLIES 

112 VOLT 9 AMP: 544.50. With crowbar ove;- 
Ivottage protection, current limiting, adjustable 
I output 11 -14V. RF suppression, easy assembly 
I Does not include enclosure and line cord. Allow 
I $10 for shipping; excess refunded. 

ll/2 AMP POWER SUPPLY: 58.00 (specily 5, 6. 
Is. or 12 Volt operation). Regulated, short-proof, 

I thermally limited, 1 A intermittent operation, Less 
lease and hardware. 

Ibjpolar SUPPLY nn-XX: 515,00 (specify 
l±SV h ±6V h ±SV t ±9V, +13V, or £15V 
I operation). Regulated, very simple assembly, 
■ virtually blow-out proof, delivers +250 mA 

|rnlnfirmm per side. 

MISCELLANEOUS SPECIALS 

I NPN transistor similar 2N3904 100/S7.95 

I PNP transistor similar 2N3906 1O0/S8.95 

I General purpose silicon signal diodes 50/S2 

I QTS308 NPN dartlngton, min gain 17000, 

I 25V 20C m A. T092 package 100/ SB. 95 

1 0OO u F 35V axial capacitor 1 D/S 2 . 00 

1 1 0,000 u F 1 0V axial capacitor 5/S2, 00 

I S-100 card edge connectors 10/529,50 

Reslslor asst. (cut & bant leads) 1000/55 

I RCA phono Jacks - these are super quality, closed 

circuit jacks that are the best we've seen in 

years. Amen can made . 20/51 . 95 

I 2 1 02 I ow power 1 K s tat ic R AM 10/59.90 

I4N28 opto-coupler 6 pin mlntdlp, 

MCT-2/1L-1 pinqut 5/52 

I SN76477 complex sound generator 1/52.50 



RIGHT PARTS/RIGHT PRICE: 

EIGHT 16K DYNAMIC RAMS $19.95! 

Fast J low power dynamic RAMS expand memory in 
TRS-80" l/lmii and Color Computers, Heath HB9, Apple, 
newer PETs, etc. 1 year limited warranty. Add S3 for two 
dip shunts & conversion Instructions tor TRS-80" I. 



CMOS ICS 

4012-S Dual i input NAND 12/52 I 

4020 -s 14 stage counter 4/52 1 

4023-S Triple 3 input NAND 12/521 

4044-S Quad H-S latch 4/52 I 

404G-S Phase locked loop 2/52 1 

4071-S Quad 2 Input OH 12/521 

4093-S Quad 2 In NANO Schmitt trig 4/52 I 

4507-S QuadEX-OR 4/521 

4510-S SCO up/down counter 2/52 1 

451 1-S BCD to 7 seg decode/ drvr 3/52 I 

45 1 2-S B channel data selector 4/52 I 
5101-S CMOS 1K low power mamory 10/517.50 | 



ANOTHER SALE PRICE! AP Products! 
solertess breadboard kit. With 1 ,032 solder less | 
plug-in tie point capacity. 

Was $24.95, now 119.951 



TERNS; C*i rn tsa (u Alio* SV s*,pDing pac«i r*run<wd I 
Q;tf*.'SuPatr J1SAadS.*h.n<!',ns VISA- *Hd W*ll«r:..c ord.r? I 
liJS *n n,m tf m[ call |4l$h H3.«», 2* flr«. InfiluiJ* ttrtfll ■□<!.. II I 
'or UP5 Pncm muDJeena cn*n i *it*ai*L rnjiicp llmlfladauinllly I 
on -v.j 1 nwa 




ELECTRONICS 

BOX 2355, OAKLAND AIRPORT, CA 94614 



MOOSE™ 

National Semi LM396 is a 10A, 70W 
regulator adjustable from 1.25V to 
15V. This new regulator has current 
limiting, thermal limiting and is 
immune to blowout from overload 
and shorts, TO-3 package requires 
only 2 external resistors to set output 
voltage. 

LM396 with specs $19.95 

SUPER CAP 

How about a One Farad (That's right, 
1 Farad) cap for use as a reserve 
power source for memory backup. 
No more worrying about NICAD 
charging times or failures. Supercaps 
supply up to 10mA for 30 seconds or 
luA for approximately 1 week. Only 
1%~ dm. x %" tall. P.C. mt. leads. 2 
voltages available. 

FAOH105Z5V $10.50 

FAOH110Z10V $10.50 

REMOTE CONTROL 

TRANSMITTER/ 

RECEIVER 

LM1871/1872 chip set has the RF and 
encode/decode for up to 6 channels 
of analog or digital link! Never an 
easier way to control toys, industrial 
processes, security systems... etc. 

Low power for battery operations 
(6V). Interfaces with standard hobby 
servos or control instruments. 

LM 1871/1872 set with specs $15.95 

D SUBMINIATURE 
CONNECTORS 

(Compare these prices!) 

PLUGS 1-9 10-24 25-99 

NEZ9P $1,95 $1.75 $1.60 

NAZI5P 2.35 2.10 1.90 

NBZ25P 2.60 2.35 2.15 

NCZ37P 4,55 4.15 3.80 

DDZ50P 5.65 5.15 4.65 

SOCKETS 1-9 10-24 25-99 

NEZ9S $3,10 $2.75 $2.50 

NAZ15S 4.20 3.75 3.45 

NBZ25S 3.35 3.05 2.85 

NCZ37S 8.85 8.00 7.35 

NDZ50S 11.65 10.60 9.65 

grm-TEH 

7808 N. 27th Avenue 
Phoenix, Arizona 85021 

ORDER TOLL FREE 1-800 -528 -0183 
(Order desk only) 

TERMS: SID. 00 minimum order. 

Visa, MC, BAG, Check, MO or UPS CO.D. 
U.S. Funds only, A2 residents add 5t soles tax. 
Prepaid orders over $50 shipping prepaid. 

OTHERS; Add $3.00 shipping & handling. 
Add S1.50 for COD. orders. 
Outside US., add 20%. 



CIRCLE S4 ON FREE INFORMATION CARD 



CIRCLE 59 ON FREE INFORMATION CARD 



GLOBAL SPECIALTIES COOP 



PROBES SOCKETS 

LP-I SSflfirj E>P 300 S1Q5Q 

LP-2 2B OO EXP-300PC 3 40 

LP-J J&QO EX-P.360 *0 

ICTEST POWERED 

CUPS PHOTO BOARD 

P£ 'I 14 OO PB-lOa 17Q0O 

PC -Hi 4 10 PR. 1 03 53 OO 

PC-24 BOO 4*0-101 26 00 

PC -40 MOO PD 100 1010 



6ITEA0SOARD ELEMENTS 

01 599 5' 200 O t 550 5? .'5 

QT47S 9 50 QT-4/B „> SO 

Q"3SS 725 OT 356 JiO 

fit ies J. 35. of us : 7t 

01 BS 3 00 0T.7IS J 75 

logic Msn.io* JUMPEH 

1D0K ImptdBrtt* WlflE KIT 

1M-1 S7SQ0 Wit I SBOQ 



P1B4 SLlT-H-WflAPTGOl «.50 ipcoH ef J J. gaga wi- ■ 530 00 

iPHSO-iB DUA^WAVU'hM RAP TQOL Unwrapi 2B-30AWG S12 10 
PlflGJA DUAlWAVWr1AFN'STRAPT0OL.WraEH?a3a»*3 S12 50 

BB04 UNIVERSAL M^KSttim[ f u1ri. Proctunr ftugbfti id 527 65 

8600V UNIVERSAL Mmrpc □ fnpul VI ProcamOr Piugband 

'£» Ahra.r BSDC & IMSAi BOBO S24 96 

*«J7 UNIVERSAL Cwnpniei PiujttDiirdL l>e» DEC LSH 1 PDP-0. 

PDP-T1 aruj Hrjthft.t M-n 570 4TJ 

HQPnccESSOR PLUGBOARD Ew aisb"* m S22 90 

£ F ULL VECTOR LINE - CaUlOfl Avatllbla On FHnfuoil 

ti^;i l i[^»-?. i n'.Tr:iv), i ,ii'ii=i,M±Qai— 

h to y«voc8mr«ui*fl iTn« ecgmAan Sciot S7 95 An 

to M>crfitcmiiutiiiii (bl'C Concaprti S1Z99 4 j>-d E B.I 
•Y*- "Xl«ti,-M«.' H*mMK'Ct JlSSfi. 1 6 fill Mrrotrninn:« Handbag SIS 95 
Ti«- CAT CeniroHoj H*i-i!h, ( >k 66.33 Tha G&QG MrciupfBraiia* Hind 
MSI SB 33 i DO Aw mbiy LanauiflP f*eQtMmmt\\i SlO 99 
651)2- Ai^inr&ly [m|].i»)p P'rjrjHjfnrYimtl S1B.33 B?D9 Aiiffmblr UTguaflP 
■njgriirrsm,^ 919 99 BuWNM SySMtl BtM*'liGu«Ja S3 95 CP J M Ular » 
■, T 512 39 i[ip> n U**rv GmFla. SIS. 00 M.£iOtib:*iauri lfn 
Wiiuf'^ini ti Cftolior SIS 94. C BASIC ' Ulrr ■» Gu.d* St 5, 00 tnlai 
HHHflfl trjS-100/FEE£ fi t JfiS(.,i..cr:rr 1 p.j!rii S15 00 Som* Comniin fl*i«£ 
Piiiij-jfUt $14.93. Pf1«J«l»l Banc Pr^Mim 915 99 5om« CoiKnon 
Bjl>: P'f.iijijint — A1«n EltdHQPi 914 99 Santo Cumiion Biiic Prrjjjr^ mi 
— 'RS Ht> Ln*i II ti.1 -111'- (14 33 S' .-n^r H"-'J tngi^tiT.^tf Banc Plcl 
y.„-.* — iApp4' H U Et'.i.o- SIS 99 



■ 
LM30INS 3? LMS'Srt ST D5 



■■HJ : l.|JJMJ.a 



LM30SH 

LM307N 

1+.13D3N SO LM334N 

LW309N 2 00 LM337h| 

LM31QN 

LM91 : ', 

LM3!7H 



75 LM319N 

. ■.':■. ii 



LM33DN 

45 LW3B0N 
t 15 lM3B*N 



f jN 3 3C LM'45SMS 40 



5 00 NE566N 



JQ LWUflBN 

B& .',rJ35'i 



50 kcaHBN VB5 lM H B00f* 3 00 

65 T605LK 1 SO 

45 7BOCK 1 BO 

35 fBIJCIt 1 60 



H00S19 

tW 19 

7402 tg 

7403 19 

7A04 1 9 

7410 20 

'430 ;o 





T4B3 


14 28 40 


74BB 


7432 25 


7495 


7436 30 


749G, 



5 50 M13SS 4B 

35 7*133 55 

45 74141 SO 

50 74T56 50 



SI 00 

2 05 
2 05 



7442 40 741 15 E 30 74>B> 



74LSO0S 

J4LSOI 
74LS02 
74L504 
f*LS.Ofl 

-4LS'0 

74 LSI 1 
74LST3 

74LS30 
74LS31 
74LS2B 
74LS2B 
74L537 
■■-:•;. 

■-■■■.■ ' 
.*t902 
74SO* 

74S0B 

J4IS10 
74S3? 

r4S4Q 

4001 S 30 

4002 10 
4O0B 1 05 
400 7 ?B 
400S 90 
401 O 50 



74L542 

74L547 

74L954 

T4LS74 

74L9.TE. 

74L5BJ 

74L&96 

74 L 5 92 

74LS9Q 

74LS112 

J4LStr2 

74LSI33 

74LS125 

74tS132 



74L513SS 35 

74LS139 .99 

74L515I 5.5 

74VS153 55 

'419156 60 

74L9159 90 

74LS1BI 70 

J4K.S 1 S3 70 

I4S.91G9 2 ID 

7*1,5169 9& 

74LS174 BO 

MLS19I T B5 

74LST43 .75 

74^5194 OO 



74974 
749B5 
7-S6BC 
74SS33 
74S134 
i r -: s ■ J a 
749E5I 



llllrlllHJJJ.l.jl 



741 B2 
74TB4 
^4t85 
74193 
74 I 99 
74221 



74L9195 9 BO 

74LS196 60 

741S34f 1 10 

J4LS744 t 10 

74LS24U 90 

74153.57 55 

74 L SJ6fl 85 

7415293 65 

74L5395 B5 

741.S35? I 00 

.Uis356 4 5 

74L53«a 45 

74L5393 1 20 

74LS399 1 20 



745153 S 9fl 
MSI 67 90 
7451 SO 3 50 
7*9162 3 00 

F4S1BI 4 00 
745195 



.200 



! LXJ 



749351 
T4525B 
74S2BD 
74S3BB 
7453H7 
749473 



: 50 
I BO 

a 00 



4Q0O SERIES CMOS 



INS 70 

1M74GA 

l*T914 

^916 
' \3GDO 
!\400^ 
I-N4003 
1N4QQ3 



V 



40124 3B 

4013 4Q 

4014 100 

4015 100 
4DE6 50 
40E9 50 
4021 

1N4O04 ~ 
IN4154 
IN4723 
1N4739 
15 2N333J3A 
.-.. ■■ 
07 2M3093A 
_0J_2N3O5SA 



4D32S 90 4041 SI 05 4070 S 40 

4073 30 4042 BO 4096 90 

4024 76 4047 130 4510 105 

4028 70 4049 40 4612 100 

4033 2 00 4090 40 45 1 6 I 05 

4034 2 60 4051 B5 4532 150 
4040 1 05 4066 55 4538 t 50 

UlliHIHU-M.hH 



2*14401 

2*5096 
2N619X 
3*449 18 
2X540I 
3»i 5 f 72 
2N5190 



2H444I 92 10 

tB 2N4442 3 15 

eo 3N4443 3 95 

&0 2N«4.44 4.50 

2S 2NSOBO 35 

T5 2N50B1 39 

50 2N5063 45 

70 2HS063 45 



I h0357 51 SO riVDSOO 5 
FlVOiOO 1 SO MA»352Q 
FKQ507 1 50 WAN3B30 



95 MAM4Q1QS2 10 MAN671053 1O 
00 VAN654Q 4 TO MAN5750 3 90 
00 MAN 6550 4 ' UV5Q33 25 



CARBON FILM 

RESISTORS 



5.. tol '/. w 10 for 40C 
vslues Vi W 10 for SOC 



BO 15 55 50 

8755 35.00 

BBSS ■' : GO 

908B 95 50 



j? BO 59 20 

Z BO 9 50 

BOBOA 4 50 

B0B5A 6 70 

fiBDO r 50 

M80A 9UPPORT DEVICES 

9312 52 25 H253 5 7 50 

A3 16 7 00 8257 10 00 

B3/24 J 5€ 8753 1 1 50 

B228 4 50 8?7& 32 00 

B23B 4 50 S279 I 20 

B251 4 SO 

EPROMtV-PflOMS 

27DB SB 30 2,718 S 7 30 



IE ALSO SPECIALIZE 

IN JAPANESE 

COMPUTER AND 

ELECTRONIC PARTS 



2101 <3M'4| 92 70 4027 [JMnSl** 25 

2102 -'UJA-. ' 3 20 (HE.iig^i 4 55 
211f[>M*4l 3.80 41181700^4, J 50 
7114 3 20 4115 ilGfr.S, 4 10 
2114L-2 4 SO 4TB4 iJpo-g,75 4C 

16K RAM 
EXPANSION KIT 

For 'RS'&0lM-u(>i I or lllj. Appte 

ot PET compintr» 
SvUSpu TMS41 1E-25>0N|$17.SS 

D*"» l u iTi,iino rt 1 Li- |wrch«t B« iar^i*fH 



CALL FOR I OUH NEW 

VOLUME I «;[*«, 

QUOTATIONS I ON request 



=3= SUNTROMCS CO., inc. 



12621 CRENSHAW BOULEVARD 

^t ^~ HAWTHORNE. CALIFORMIA 90250 

^^^r^J^ •lqcaied h'fjil frj (CitvtitA *,li"ji*T-rfiii 

^^ m ^^ 5TOFEE HOURS Man h , (J4Mk)Tr>>M - Eji HjAWTLflfV 

\n CAmFOPNlA OUTSIDE OA4.1FORNIA TOLL Ffl£E 

(213) 644 1149 1-800-421-5775 

Mai] Ordflr — ftfo Minimum: Sflnd Morw Olflo. w Chect lo 
PO BOX1S57, HAWTHORNE. CA3OIB0 U» m VISA or Millie 
card (OIIIM Wlducto «»DiMl<in ditii And S? 00 fjo&uge irKJ runOI-ng 
to ftrriui Ciljtoiivr rt«<]«ria, *dd &s uiu In 




Clamp-on Model 
M-1409 
$108 



Clamp-on Model 
M-200 
$120 



Floor Model 
M-1410 
$141 




COOL, ENERGY-SAVING FLUORESCENT TUBES 

| MAGNIFIER LAMPS 



Keep Both Hands Free While You Work! 

The lamps bend and swivel, can be used when 

sitting, standing, or even lying down. Ideal for 

reading, for vocations or avocations. 

They are superb as regular lamps and they are 

glare-free. 

Each is a precision instrument with a 5" diameter 
double convex lens, 3 diopter power, 8-18" focal 
length. 

Your choice of warm-brown bronze or gray. 



Desk Model , , , _ , . _ _ _ 

m-1470 An M - 2 series lamp uses 1, 2, or 3 F6T5 6-watt 

$121 tubes, three of which are included with each lamp 

in that series. 



An M-14 series lamp uses an ordinary 8" round 
fluorescent tube that is available in most hardware 
stores. We are reluctant to ship it because of breaR- 
age problems. 

An Add-A-Lens increases magnification to 10,3 
diopters. $15.00, fits only round tube style. 

Conversion unit converts caster model to clamp- 
on, $15. Specify color. 



Please tell others about the availability of these 
lamps. 

Prices subject to change without notice. 
Postpaid; shipped only within the USA. Send check or 
money order. Michigan residents add 4% sales tax. 





Desk Modal 
M-270 
$129 




Caster Model 

M-141Q-H 

$143 





Underside View 
Round tube style 



Underside View 
Three tuba style 



Caster Model 

M-Z10-H 

$154 



P< 



Magnifier Lamps • Dept. RE-81 «P.O, Box 1261 • Midland, Ml 48640 



CIRCLE 38 ON FREE INFORMATION CARD 



o 

< 
m 

CD 

m 

2] 



133 




FREE! 

1981 

DISCOUNT 

ELECTRONICS 

CATALOG 



JOIN THE PAK! 
Send for our Free catalog and become a 
member of our exclusive Pak. Our . . 
members receive Poly Paks' 
exciting catalog several 
limes a year. We offer: 
Penny Sales, Free 
Premiums and Low, 
Low Prices on a wide variety of 
Electronic Products such as Computer Periph- 
erals, Integrated Circuits, Speakers, Audio 
Equipment. Rechargeable Batteries, Solar Prod- 
ucts, Semiconductors, and much, much more! 
Take advantage of our 25 years as America's 
foremost Supplier of discount electronics. 



RUSH ME YOUR FREEDtSCOUNTCATALOGl 
NAME: 






ADDRESS: 

CITY: 

STATE: 



_ZIP: 



CLIP AND MAIL COUPON TODAY TO: 

POLY PAKS, INC. 

P.O.Box 942, RA11 

S. LYNNFIELO, M A. 01940 61724 5-3828 



CIRCLE 36 ON FREE INFORMATION CARD 



FOTO-SLAVE TRIGGER KIT 

PrOI-ILY THE NOJI lEISIliK IL#M 1ftl£t[ 
ON rm n*nr(1. UcT ^ffriCTIO IT JHtltHI L 
HUGN IUPERIH THIN LA5CR TTFEI, TNll KIT 
OFEftAII rut" icrli*£I 0* inimrct rL*i'i. K 
I '■■iL"-" t- >L1 "■■■It, UlCUll I0IRS *10 El 
£D»n fCb CeMVAECT I M 10 ETflOEt., Z j; L : I .V 




C4<50 jgjfl 



WHEEL OF 
FORTUNE KIT 



C3HM »J9 




Popular game device u»s 
L£Dt, irinuiiorj, and IC 
to give in* elTacl of ■ bright 

red tj.ili ipinnlng ground 
lumOcrs Unit emits sound ai 
ball spin* and finally smps-pn 

a number I tie I- ail parts. 

tac«piata a PC boarcf. 



SEQUENTIAL LED FL ASHER KIT 



It tlP.CU.J.«Y SIOUEMULLT Llth 
If 1 H(C LED* ££ N 1 1 HciuH.v . HiTh , 
►HT* *•>£< PC 1*1*5 h S1«J S.JS' 

1 ,5*. Bev«i«s if nrtt*T. 

C-**)f 16,76 



| WW i if|j) 




FASCINATION STAR KIT 

PfluEbiK jm "eiPtoemc m*" vimit effect 

LUES 35 LCDS INE IC £<BttllTRT, Gn.ll Hit* 

Ipea tETTi* fm Eriscat, U£* Wuh «.e. p*hT 
kUl K lOftBDu SUE: :t>J" I 1A% KCc*MRXl 

'!"■ '.■■1||1 1 

C4411 510.85 



SOUND EFFECTS KIT 

Cfr*J"CT rpT UH't THE ■>QPU_A* fa! rit. 1 ? Ml 
T«J CftlLli MI5B*, LOCC^JliyE. ■IKE'.. 
Pin:-!, ETC IgfWDt. WllH «LL fARIS PC 
■«*■& ile iFEilEH, S|VC: 3*35* ■ ?■ , 

NEi^itflEi yt uirmr. 

KIT C4422 115.05 
ASSEMBLED C44J3 ■ T5.G5 



I 



J» 



& 



G nrCM NCONtJ 

BUM fjf 

tREEH. JT 

1 dh ff 

, t 



EitEpr 

IEHT 

cinhJTn 



PHOTOFLASH 
CAPS 



120 VAC 

Xenon 
Strobe Kit 



C23Q71 S7.5C 



!5 n 

72f» 3«0V LJ 
JCJ330 i1;£5 



«-/> 

■? 



uui<4l§ 



<s>* 



OLAR POWER SALtr" 

• ! a.9S ClftnT !■ wnoiC «U 
:.n'i" "Litclit ,'V <t MHnj 



SKEIN. ?V SOMA 
WITEftT Hm«E- 
hthl hMiLL ran 
fg-fp in; TpHhtlt- 
TOft HOio. ittlu- 

uit.«- cwt itajxj 



LARGER SOLAR PANELS jl 






1 S9.rx :l " 



-© 



CHANEY 



P.O. eox r?c sa . 

DENVER. COLORADO B0227 



glgCLr-QniCS mc. 



Phone Ord*r* ' Mifii-nurn AP Order 56 CC 

303-761-5750 * Pl «» include Si. SO lor pcMtaoe 

* VISA MC Beef pled 

' Prion* orrJera mtE welccinH 

Stntf rev our fee cs'tio^ or urtrcjue rfomt 



CIRCLE 24 ON FREE INFORMATION CARD 



S 

z 
o 
tr 

t- 

&3 



o 

Q 
< 

134 




t QUALITY parts at 
* DISCOUNT PRICES! 



4PDT PRINTED 
CIRCUIT 12 VDC 



14 pin Ityl* 
3 imp contKll 

BRAND NEW 

P.C Mount 
$2.75 EA. 



DPDT RELAY 

aromat |2 VDC 

HL2-P-DC12VDC 
compact ill* 
10 imp contact* 
PC mount 
S3.00 each 



4PDT RELAY 



lipirt *1(l» 

1 : 1 -r ;:■:■'. 1 . '-. 

' JttflllfC c 

■ fO ton » £ C0-I 
« L'itaadl luiif lii'tb 

$1.70 EACH 



ITBANSFORMERS 

120 volt 
primaries 



sockets fan ntt** «k 



9t 



6 VOLTS al 150 mt $1.IS 
1i VCT.a(500mA J2.50 
1S.5 V. at 3 AMPS tB.SO 
15 VOLTS at 1 AMP S4.S0 
25.2 VCT at 2.8 AMP SS 50 



440/220 TO 110 VOLT 
TRANSFORMER 

SOLA = HTISZIOO 

'440 ot 220vol!a 

to HO volti 

Rated 100 VA 




KEY SWITCH 

*'' RATED 4 AMPS 
jr 125 VOLTS 

$ 3.50 EA. 



MINI SIZE 
BUZZERS 

l}£ to 3 VQlU 

yiT>< WIRE LEADS 

75«. a ch ||[ 
1 J4 >« 3 Klta 
WITH P1H TERMINALS 

75««ach 
3 to 7 volla 

HITH PIN TERMINALS! 

75c each ^V 



'iA 



»it.w 



n 



COMPUTER GRADE 

CAPACITORS 
1,700mfd 

150 VDC SS.OO 
2 l/2"o,« >: 4 Jia" 
6,40Omfd 

so vac $2. 50 

I 3fa"n,*X A 1/4" 
11, 5GOm!d IS VPC$l.51l 

1 3(8 "ai* XJI/t" -in., 

20,000 mfd 2s volts 

2 " DIA. X 2)j" HIGH si.QQ 
22,O0Omfd 15 VOC S2 . 50 
2"oi«X2 Il2"„„.„ 

22,000 mfd <ta volts 

2" DfA, X 6" H1CH Si.OJ 
52,000mfd 15 VDC 43.00 
! r .nXt l/2 



CL*MP5 TO FIT CAPACITORS Sfc vi 



SEND FOR OUR NEW 
? e/ 40 PAGE CATALOG f (C 



TYPE N 
CONNECTOR 

KINGS UG526 B/LF 

FITS RC5S, (Git, 
Hfilftl, EGlttJ; RG223 
SOLDER TYPE 

$1.75 EACH 
.10 for £16.00 



'SPECIAL 1!* 

10 MEG POTS 

4 tor »1.00 

10 lor M 30 
100 lot S1S.00 



SUPER SMALL 

PHOTO-FLASH 

170 MFD 330 VOLT 
t Vx '%" 
2 for $1.50 
10 for $7.00 



750 MFD 330 V 
PHOTO FLASH 

2" HIGH X f*S& 

I 1/V DIA. f*«tfj 

51.25 EACH "■'-' 

10 FOB 511.00 U-ls: 



RFI 
LINE FILTER 

tor Una to Una 

4 Una to ground 
noJa* auppratiton 

COflCOM • IOKS 
%.* H«t«d:tOimp 
115 350, 50-400 n i 

$ 3.75 es, 10 1« S3s.oo 



12/44 EDOE CONMECTOR 
TINSOLDEfiTAII. 1»"» 200' 



lARREQUANTlttESAVAILABiE 



L.E.D.s 

STANDARD JUMBO 
DIFFUSED 

RED to FOR $1,50 
GREEN 10 FOP 52.00 
YELLOW 1.0 FOR M.DD 

FLASHER LED M 

5 VOLT OPERATION 
JUMBO SIZE 

2 FOR SI. 70 

POLAR LED 

1 FDR S1.7D 
SUB MINI LED 



E 



* 



! 



,079' K .098" 
20mA at 1.7S. 

10 FOR SI. 00 
200 FOR 51 3 .00 

O^WNTITY PRICES AVAILABLE 



CANNON XLR 
CONNECTOR 



5 PROWS 
CHASSIS MOUNT 
AUDIO COfcHLCTCR 

S2. 00 EACH 
10 tat * 19.00 




RECHARGABLE 

SEALED 

LEAD-ACID 

BATTERIES 




6 VOLTS J AMP HP. 

2 5/5 X llj X 5 IN. $7.50 
8 VOLTS SAHP/HR 
51j X 2 X «[ IN. $10.00 
B VOLTS 7' 2 AMP. MR 

l«lj X 2 X *lf IN. S 12. SO 



ALL CLECTROniCS CORP. 



905 S. Vermont Ave. 
PO BOX 20406 
Los Angeles, Calif. 30006 
(213)300-8000 

Mon. - Fri, Saturday 
9 AM -5 PM 10 AM -3 PM 



■ Qujnhhg-i timi(*a 

-Mm Orriri J1&00 
•"■-'.: £2.50 

SruppHrtig USA 
-CbIiT fit: Add 5". 
* Prompi Sntpp>rtfl 



CIRCLE 55 ON FREE INFORMATION CARD 



CIRCLE 40 ON FREE INFORMATION CARD 



JAVANCO 

Your Parts Super Market 



RY-83 4PDT relay 3A contacts (socket mt) or pc .6x1,1 x1.2* 

24VDC coil EA. $ 1.65 



RY-55 SPST relay .5A dim .925 x .375 very tiny 6VDC coil 
encapsulated 



,29 



CTR-31 Contactor reversing magnetic 110V coil appr. 18 A 
contacts 



16.00 



SA-15 Module board contains 6 digit display plus 3 drivers 
and more 



3.50 



SA-24 FET voice actuated module complete w/mike 
(with inst ructions) 9 VDC 



1.90 



IC-91 ML 8204 IC tone ringer (matte Off premise ext ringer 
dia. furnished) 



1.90 



JCO-1 Big J power supply kit adjust 9 thru 15 V regulated 
kit w/o cab. & cord 



12.00 



LED-1 6 digit 7seg. readout takes 3 drivers SCL4433 ABE (165-1 on unit) 
7/10" characters pinout for LED-1 furnished (1) readout 
3) drivers 3.80 



TR-54 Transformer 120VAC pri. sec 1 6V sec 2 12V sec 3 24V 
sec. 2.7A 



6.00 



LA5-7K Lamp kit contains 7 455 lamps w/built in flasher (7) 
GE 455 lamps 



1.00 



FP-51 680 MFD VDC capacitor insulated can (Nichicon) 1.00 

ECK-48 (48) Electrolylics marked and unmarked all guaranteed 

good (48) pes. ______ 1.40 

ECK-5Q (50) asst. lytics all marked all guaranteed good 

none under 12V (SD) 3.80 



1C-148 MK50427 Mostek 40 pin IC used to project time/date 
on CRT pinout inc. 



3.35 



2.25 



PCB-3 Printed circuit boar d single side 7% >- 24* (tuft stuff) 
SA-25 Module complete one watt amplifier with switch and 
volume control EA. 235 



PLEASE TAKE NOTE: We have one of the largest stock In USA but 
sometimes quantities are limited (first ordered) (first shipped) we have a 
very large inventory and warranty every part we sell or money back 
guarantee to be as we offer them to you. We want to be your (Parts 
Supermarket.) (JAVANCO) 



We will never intentionally misrepresent an item (we want your repeat 
business) 



FPK-7 (7) FP cans asst. canac. asst 7 good usable FP cans contains 
at least 1 ea. 20-20-20-20 @ 450 V and 1 6800 MFD 50 volts 



(7) FP,S_ 



3.80 



VHFT-1 VHF solid state tuner (TV channels 2-131 why pay 

oyer $19.00 ONLY 9.40 



VHFT-1 UHF solid State tuners (TV channels 14-83) why pay 

over $4.00 ONLY 2.50 



FBK-1 High voltage transformers (fiy backs) asst ASST. (3) 5.75 

ME-17 Meter (record and bat tery level) vertical read .8 x .8 x .85(1) 1.80 
ME-18 Meter (scale to 100%) 1.4 D x 1,4' Hgt (1) 2.40 



ACF-1 AC filter (great for mini-computers) chassil or 
bulkhead mt. 3d amp. 



9.00 



BX-5 3 ;-; 5" in dex card box (clear with hinge d smoked top (2) FOR 90c 
Y5- 6 ColorjrV yoke ("M agnavoxl numb er 361380-6 16 00 

YO-1 "ColorTv yoke JMagnavox) number 361350-3 



IC-139 MLM301 8 pin gp amp ECG eg: ECG975' 



22.00 



TRA-111 TIP29 TO-220 case NPN or 393-1 



(3) FOR 1.00 



SPK-1 Piezo super horn tweeter (needs no crossover ) 
ADA-1 120 VAC adaptor to 7.5 VDC 150 ma 72" cord 



(3) FOR 1.35 



ADA-7 120 VAC adaptor to (VDC 100 ma 72" cord and min 
plug and 



(1) FOR 7.25 
(1) FOR 1.40 



(1) FOR 1.40 



ADA-20 120 VAC adaptor to 12VAC "(limited "quart,} 700 m a 
SW-21 Cherry switch # E23-45AX SPST normally open 
IC-3 LM324N (marked 163-1) on unit 14 pin inline 

(,40c EA) or (3) FOR 1.00 



(1)FOR 2.80 
(3) FOR .65 



IC- 4LM326 regulator (mark ed 123-3 on unit {75<t EA) or (3) FOR 2.00 
IC-14 LM1808.FM IF AF PO 2 watt EQ ECG 826 (1) FOR 1.50 



[C-Z O 401 1 B marked 401 1 B a repeat of a sellout 



IC-23 4017 (marked B1-1) 



"TEA.) .17c 



EA. ,90c (1 0) FOR 7.00 



IC-27 SN75110 marked 75110 FM-stereo multiplex 
demodulator 



(EA.) 1.35 



IC-28 AY#-8500 1 g a me chip 28 pin General Instrument 
lC-34 300 7272-OOF eg; ECG 9945P RS clocked flip flop 



(EA.) 1.00 
(EA.) .456 



$10.00 minimum order add $2,50 shipping TN. res. add 6%% tax 

orders over $25.00 call collect 615-242-7575 we want to serve you 

Visit our display center 154 Second Ave.. South Nashville, Tenn. 



Stay a step ahead new listings at prices you can afford, with ea. order 
advance copies of nationwide advertising and all current offerings will 
be furnished. 

JAVANCO 

Your Parts Super Market 

150 2nd Ave. S. Nash. TN 37201 



CIRCLE 75 ON FREE INFORMATION CARD 



■M^H 






nn 




HITACHI 

30 MHZ DUAL TRACE 
OSCILLOSCOPE 

AT THE LOWEST PRICES 
YOU CAN FIND! 



• Signal delay fine 

• 5" CRT 

• 12 ns rise lime 

• TV sync separator 

• 1 mV/division sensitivity (max.) 

• Vertical magnifier (x5) 

• Sweep magnifier (x10) 

• X-Y operation 

• Front panel trace rotation 

• CH1. CH2. Add. Diff. display 
modes 

• "2" axis (intensity) modulation 

• Two years parts and labor 
warranty 



Model V302B 



List 995.00 

Sale 815.00 

See beiow for freighi allowance _ - .*.,'„ . . . .* 

• Two -X1Q probes included! 



15 MHz dual trace 

AN EVEN GREATER VALUE! 




Model VI 528 

List 735.00 

Sale 599.95 



• 5" CRT 

• 24 ns rise time 

• TV Sync separator 

• 1 mV/div sensitivity to 5 MHz 

• Vertical and sweep magnifiers 

• Front panel trace rotation 

• Five modes of vertical 
deflection 

• Two years parts and labor 
warranty 

• Two -X10 probes Included 



ALL OTHER HITACHI SCOPES ON SALE 

50 MHz. 100 MHz, 35 MHz. 20 MHz Call for details 
Also available: 
Leader Instruments, Beckman, Univolt, Fluke. 
and other quality test equipment 



To order call toll free: (800) 423-5336 

In Calif. (S00) 423-5336 
Local, Alaska, Hawaii (213) 701-5848 

g^k M^ K A PIV OF ALLIANCE RESEARCH CORP 

OREk Electronics 

18215 Parthenia St. Northridge, CA 91325 



i TERMS: All items are subiecl [c prior sale LimMed quantity on hand 

Payment Visa Mastercard accepled Exact freigh! and insurance will be added 

COD orders accepted Ircrn recognised businesses 

Prepaid orders: Payment must he made with US currency Orders paid wvilfr 

personal or company check will be heJd lor check to clear 
I Free IrcigM policy: Prepaid orders paid by cashiers check will be shipped UPS I 
; freight free to any pomi ;in the con I mental US (Alaska. Hawaii. Canada excluded ] I 



CIRCLE 52 ON FftEE INFORMATION CARD 



3 

m 
m 

33 

CO 



135 



ADVERTISING INDEX 

RADIO-ELECTRONICS does not assume 
any responsibility for errors that may 
appear in the index below. 



g 

Q 
< 
BE 



Free 

17 
12 
65 

6 

66 
40 
64 
8,60 

73 

63 
58 

26 



35 
57 
24 
32 
42 



Information Number Page 

AMC Sales , 130 

A,P. Products 83 

Active Electronics 103 

Aihwice Electronics 14-15,28 

Adtanced Computers ... . 114-115 

Aliia Electronics 86-87 

All Electronics 134 

Alfex Electronics 122 

American Antenna Cover 2&4 

Ancronn ......... ,..„,,„... 127 

Bagnill Electronics 136 

BBC Metr»»«te/Goerti.., 33 

B& K Precision .-.....„...., 2 

Karel Bart« 136 

Beckman Instruments Inc, Electro- 
Products Group Cover 3 

Bullet Electronics 126 

( ![■:, Cleveland Institute of 

Engineering 38-41 

CFR, Associates , 108 

Cambridge Learning 93 

Chancy Electronics 134 

Channellock Inc 88 

Colorado Electro-Optics 123 

Command Productions 1 16 




p get security 
products for home, business and in- 
dustry, Mountain West is a one-stop 
supermarket for professional alar 
installers as well as do-it-yourselfers. 
Systems and parts range from simple, 
quickly installed units to the most 
sophisticated electronic equipment. 
68 pages are filled with pictures, 
diagrams and instructions. 



Mail to; Mountain West 
4215 N. l6thSt. 
Box 10780 Dcpt RE- 11 
Phoenix, A?.. S5064 

YES, I want a FRKE CATALOG. 

\U name k 

I li a .ii 

In Siatt 7.ip 



or call TOLL-FREE 
(800)528-6169 



II Communications Electronics 13 

16 Comjtonents Express Inc 104 

41 Concord Electronics 126 

— Cook's Institute of Electronic Engineering 

116 

— Dace Scientific 106 

— Data Sertice Company 102 

55 Diamondback 134 

5 Digi- Key Electronics 107 

— EI A Distributor Products Division 76 

— EduCalc 100 

29 Electronics Book Club 75 

37 Electronics Chersea's Corp., Inc 99 

20 Electronic Specialists 132 

— Electronic Technology Today 77 

34 Etco Electronics 131.136 

18 EtTOnix 1 16 

— Fair Radio Sales 106 

— Fanon Courier,.,..,,,..,,....,...,,...,., 106 

43 Fluke S 

— Fordham 99,1 16 

7 Formula International 128-129 

44 Fuji-S»ea 104 

84 Future Tech 100 

67 Gladstone Electronics 97 

78 Global Specialties 17 

— Global TV Electronics 102 

59 Godbout Electronics 132 

— Grantham College of Engineering...., 96 

21 Hai-Tronix 132 

13,82 Hameg, Inc 24-25 

31 Heath 29-3 1,36,37,8 1 

— High Frontier , 104 

85 Hitachi Denshi 91 

25 Httntron Instruments .. 101 

— Information Unlimited 106 

47 International Electronics 112 

48 JDR Microderices 124-125 

9 Jameco Electronics 110-111 

23 Jan Crystal 96 

75 Javanco 135 

10 Jim-Pak Electronic Components 105 

74 KLM : 101 

79 Kantronics 98 

56 HJ.Knapp 130 

— Komac Corp .....„„....—...- 108 

76 MTl 95 

— McGee Radio „ 106 

— Magnifier Lamps 133 

30,28,83 Magnatox 1,7,70-71 



14 

51 



49 



72 
52 
70 
53 

77 

45 

22,80 

36 

46 

33 

3 

61 

2 



62 



71 

27 

38 

4 

69 

15 

81 

19 

68 



Meshita Inc 108 

Micro Ace 122 

Micro Management .>..,„.....,.,.,.-..... 106 

Microti' una 102,106 

Monarchy Engineering 1 12 

Mountain West 136 

NRI Schools 8-11 

NTS Schools 18-21 

Nabih's Inc 97 

Netronics 84-85 

North American Soar Corp 89 

Ora Electronics 135 

Omega Sates ......„..**..,*.,....-. 23 

Pacific One Corp 96 

Pac Tec 80 

Page Digital 120-121 

Paia Electronics 95,98 

Poly Paks 134 

Priority One 118-119 

RCA 32.79 

Radio Shack 113 

Ralar Instruments 108 

Ramsey Electronics , M7 

Sabtronics 94 

Satellite Computer Strikes 102 

SCR Electronics 136 

Simple Simon 130 

Sinclair Research Ltd 34-35 

Solid State Sales 131 

Spacecoast Research 102,104 

A.W. Sperry Instruments Inc 42 

Suntronics Co Inc 133 

Surplus Electronics. 109 

TSE, Hardside 95 

Techni-Tool Inc 80 

Tr! Star Corp 98 

Texas Instruments 101 

Vermont Electronics 130 

Viz Manufacturing Co 27 

Wersi 97 



30 CHANNEL 
, CABLE 1 
'CONVERTER 



OnOERNo. t7!A£CU7 

IB3TX3C3 ROUTE 9N. 
IPLATTSBURGH.N.V. 12901 
I T«l,: 15181 561-3700. . 



rm 



l ELS 



CTROWIC 



PAG 6 



OE M 



CAli 



I one o CAPACITANCE METER lpF to999KuF 
'"i O FREQUENCY COUNTER 35MHz 
kit O SQUARE WAVE GEN. 1Hz to 99KHz- 
OhMMETER -3.58MHz xtal -Regulated PS- Five 
8" Readouts-Low cost TTL Circuits-Automatic 
Decimal Placement-Be AMAZED —Build it for 
S50 or less. 1 Purchase the plans, etched P.C. 
board 4-3/4" by 6-3/4" and front pan el deca l 
lorS15 29l BAGNALL ELECTRONICS, R,") U n I )\ 
179 May Street, Fairfield, Conn. 06430 "■* Ktt " 




HUNTINGTON'S 
DISEASE 



NATIONAL 
HUNTINGTON'S DISEASE 

ASSOCIATION 

Suite 501. 1441 Broadway 
New York, NY 10018 
212-966-4320 



79-2 



HIGHLIT 
PROFITABLE 



ELECTRONIC 



ONE-MAN 
FACTORY 



Investment unnecessary, knowledge not re- 
quired, sales handled by professionals. Ideal 
home business. Write today for facts' 
Postcard will do. Barta-RE-S, Box 248, 
Walnut Creek, CA 94597. 



SCR SUPER- BUYS 



UPS ANYWHERE IN CONTINENTAL US. 

0FREE SCRAMBLER PLANS plus a brochure 
describing out new UHF*VHF Conversion Kti 

are yours just by sending us your name, 
address tad an l&t stamp. 

© VHF VARACTOlVTUNER. 300 Otims input. 

Tunabte tar Channels 2 -so- t.3 All sotid-stale 
Made Ay leading name manufacturer Mew- 
surplus. 

A Bfl AND NAME POWER SUPPLIES. t5W6A 
Voltage aciusrauie and ic reguJaced Ideal 
lor CMOS computer based instruments, etc. 
New -surplus 

i 6-FQ07 TELEPHONE CORD With AMP 
a rang- modular phone-jack at one end and 
4-space-Ljg leads at the otnei fciofrnaily 
priced at S2.49 each 
•Gall us lor special large quantity pricing quQlalions. 

(714)527-2554 » [213] 596-7553 

ELECTRONICS INC. 

9533 Valley View Street, Cypress. CA 90630 

(10.00 MIN. ORDER HANDLING/SHIPPING S5. Oil 

Pay by CHECK. M.O., VISA, M/C, COD. 



FREE 

s 4 95 „ 

S2395 

99c!» 



136 



22 Megohm 

Input Impedance 



12,000 Hour Continuous 
Battery Life 



Audible Continuity 
On-Off Switch 

True RMS Select Switch 



lorac only or ac+dc 



Insta-Ohms Visual 
Continuity Indicator 



n -Circuit Resistance 
Measurement 

20(1 Low Resistance 
with Zero Adjustment 




10 Amp ac/dc 

1500Vdc/100OVrms 

Overload and 

440 Vdc/Vrms Resistance 



Temperature Probe Input 
'(-20°Cto+1265°e) 



in-Circutt Diode/ 
Transistor Test Function 



Introducing the TECH 360 

DMM. Never has it been 
so easy to do so much for 

so little. 



Beckman'sTECH 360 bench/ 
portable DMM puts unmatched 
capability and convenience at your 
fingertips. 

You can select from 8 functions 
and 31 ranges with one turn of the 
single selector switch. 

On or off the bench, you can 
accurately measure all complex 
waveforms with True RMS AC func- 
tions. Extend resistance measure- 
ment to 1/100 ohm resolution. Read 
temperatures from — 20°C to 
1265°C. Perform continuity checks 




quickly, with audible and visible 
indications. Measure up to 10 amps 
without adding special adaptors. 
All with 0.1% basic Vdc accuracy. 

12,000 hour battery life 

Designed for ultimate ease of 
operation, the TECH 360 delivers 
12,000 hours continuous service (up 
to 4 years of normal use) from stan- 
dard heavy-duty batteries. You'll 
never have to search for power out- 
lets or contend with ground loop 
errors. The expense of rechargeable 
battery packs 
is eliminated. 



The TECH 360 is available 
for just $289 (U.S. only), including 
batteries. The companion TECH 
350 (without RMS and temperature 
measuring capability) is priced 
at $229. 

For information on the com- 
plete line of Beckman DMMs and 
accessories, call your local distrib- 
utor today. For the one nearest you 
call: (714) 993-8803 or write 
Beckman Instruments, Inc., Electro - 
Products Group, 210 South Ranger 
Street, Brea, California 92621. 



Convenient storage and multiple viewing angles 
are featured in the new line of Beckman bench/ 
portable DMMs. 

CIRCLE 36 ON FREE INFORMATION CARD 



BHCKMAN 






>N APRIL 24 th 1981 A PROFESSIONAL 
NDEPENDENT TESTING LABORATORY 



11* VJ tf iJlti!* * loi J i re) dMi iia^ilaf»):l 1 ,TM:N 



ADAR DETECTOR IN THE WORLD! 



1 

2 



ESCORT, WHISTLER, FOX, JR. MICROWAVE, 
SUPER SNOOPER AND FUZZBUSTER ALL 
COMPETED IN THE CONTEST. 

THE BRAND NEW K40 RADAR DETECTOR 
USING A UNIQUE WAVE GUIDE COUPLED 
DIE CAST ANTENNA DETECTED X BAND 
RADAR AN AVERAGE OF 54% FURTHER 
THAN ALL OTHER DETECTORS AND 67% 
FURTHER ON THE K BAND FREQUENCY. 



3 



HERE'S THE TEST* 
THAT PROVED IT! 



TEST RESULTS 



KlflOTETJHEfi 

HUE! 

E5COHT 

GUL 

m. 

RADAR 
INTERCEPTOR 

I'.r i,;-Ii i ri QIQQQ 
RITTJTHCMCS 

TO 



nWBMDXRK-BfM) 

dstaece fRam cm 

EH6 MILES 
230 K1H.ES 
22H RULES 
iS MILES 

1H2 MILES 
UA mii.ES 
130 MILES 
L5S MILES